diff --git a/js/lightroom.js b/js/lightroom.js
new file mode 100644
index 0000000..699fa25
--- /dev/null
+++ b/js/lightroom.js
@@ -0,0 +1,130 @@
+import { ALLOWED_EXTENSIONS } from './settings';
+import { createCommentTemplate } from './util';
+
+export const lightroom = (posts) => {
+  const bigPictureElement = document.querySelector('.big-picture');
+
+  // ---
+  // HELPERS
+  // ---
+
+  function setBigPictureData({ url, comments, likes }) {
+    const imageElement = bigPictureElement.querySelector('.big-picture__img img');
+    const likesElement = bigPictureElement.querySelector('.likes-count');
+    const commentsShownAmountElement = bigPictureElement.querySelector('.social__comment-shown-count');
+    const commentsTotalAmountElement = bigPictureElement.querySelector('.social__comment-total-count');
+    const commentsListElement = bigPictureElement.querySelector('.social__comments');
+
+    imageElement.src = url;
+    likesElement.textContent = likes;
+
+    commentsTotalAmountElement.textContent = comments.length;
+
+
+    // START OF TEMP AREA
+    commentsShownAmountElement.textContent = comments.length;
+
+    const commentsShownElement = bigPictureElement.querySelector('.social__comment-count');
+    const commentsLoaderElement = bigPictureElement.querySelector('.comments-loader');
+    if (!commentsShownElement.classList.contains('hidden')) {
+      commentsShownElement.classList.add('hidden');
+      commentsLoaderElement.classList.add('hidden');
+    }
+    // END OF TEMP AREA
+
+    commentsListElement.innerHTML = '';
+    const commentsListFragment = document.createDocumentFragment();
+    const commentTemplate = createCommentTemplate();
+
+    if (comments.length > 0) {
+      comments.forEach(({ avatar, message, name }) => {
+        const commentFragment = commentTemplate.cloneNode(true);
+
+        const commentImageElement = commentFragment.querySelector('.social__picture');
+        commentImageElement.src = avatar;
+        commentImageElement.alt = name;
+
+        const commentTextElement = commentFragment.querySelector('.social__text');
+        commentTextElement.textContent = message;
+
+        commentsListFragment.append(commentFragment);
+      });
+
+      commentsListElement.append(commentsListFragment);
+    } else {
+      const commentFragment = commentTemplate.cloneNode(true);
+
+      commentsListFragment.append(commentFragment);
+      commentsListElement.append(commentsListFragment);
+    }
+
+  }
+
+  function getPostByImageSource(src) {
+    const regExpId = new RegExp(`/[0-9a-zA-Z]+.(${ALLOWED_EXTENSIONS.join('|')})$`, 'g');
+
+    const postId = parseInt(src.match(regExpId)[0].split('.')[0].split('/')[1], 10);
+    const postData = posts.find((post) => post.id === postId);
+
+    return postData;
+  }
+
+  function onModalOutsideAreaClick (evt) {
+    if (evt.target.classList.contains('overlay')) {
+      bigPictureElement.classList.add('hidden');
+      document.body.classList.remove('modal-open');
+
+      document.removeEventListener('keydown', onEscapePress);
+      bigPictureElement.removeEventListener('click', onModalCloseButtonClick);
+      bigPictureElement.removeEventListener('click', onModalOutsideAreaClick);
+    }
+  }
+
+  function onModalCloseButtonClick () {
+    bigPictureElement.classList.add('hidden');
+    document.body.classList.remove('modal-open');
+
+    document.removeEventListener('keydown', onEscapePress);
+    bigPictureElement.removeEventListener('click', onModalCloseButtonClick);
+    bigPictureElement.removeEventListener('click', onModalOutsideAreaClick);
+  }
+
+  function onEscapePress (evt) {
+    if (evt.key === 'Escape') {
+      if (!bigPictureElement.classList.contains('hidden')) {
+        bigPictureElement.classList.add('hidden');
+        document.body.classList.remove('modal-open');
+
+        document.removeEventListener('keydown', onEscapePress);
+        bigPictureElement.removeEventListener('click', onModalCloseButtonClick);
+        bigPictureElement.removeEventListener('click', onModalOutsideAreaClick);
+      }
+    }
+  }
+
+  // ---
+  // LISTEN TO CLICKS AND OPEN MODAL
+  // ---
+
+  const imagesContainer = document.querySelector('.pictures');
+
+  imagesContainer.addEventListener('click', (evt) => {
+    const thumbnailElement = evt.target.closest('a.picture');
+
+    if (thumbnailElement) {
+      evt.preventDefault();
+      bigPictureElement.classList.remove('hidden');
+
+      const pictureElement = thumbnailElement.querySelector('.picture__img');
+      const postData = getPostByImageSource(pictureElement.src);
+      setBigPictureData(postData);
+
+      document.body.classList.add('modal-open');
+
+      const closeButton = bigPictureElement.querySelector('.big-picture__cancel');
+      bigPictureElement.addEventListener('click', onModalOutsideAreaClick);
+      closeButton.addEventListener('click', onModalCloseButtonClick);
+      document.addEventListener('keydown', onEscapePress);
+    }
+  });
+};
diff --git a/js/main.js b/js/main.js
index b2d9246..47b5504 100644
--- a/js/main.js
+++ b/js/main.js
@@ -1,6 +1,8 @@
 import { displayPosts } from './display-posts.js';
 import { getPosts } from './get-posts.js';
+import { lightroom } from './lightroom.js';
 import { AMOUNT_OF_POSTS } from './settings.js';
 
 const posts = getPosts(AMOUNT_OF_POSTS);
 displayPosts(posts);
+lightroom(posts);
diff --git a/js/settings.js b/js/settings.js
index 41594da..b2bcee9 100644
--- a/js/settings.js
+++ b/js/settings.js
@@ -31,11 +31,20 @@ const DUMMY_DESCRIPTIONS = {
   ]
 };
 
+const ALLOWED_EXTENSIONS = [
+  'webp',
+  'jpeg',
+  'jpg',
+  'png',
+  'avif'
+];
+
 
 export {
   AMOUNT_OF_POSTS,
   DUMMY_COMMENTS,
   DUMMY_NAMES,
   DUMMY_SURNAMES,
-  DUMMY_DESCRIPTIONS
+  DUMMY_DESCRIPTIONS,
+  ALLOWED_EXTENSIONS
 };
diff --git a/js/util.js b/js/util.js
index b5cf1a6..ecfa0b1 100644
--- a/js/util.js
+++ b/js/util.js
@@ -14,3 +14,22 @@ export function getRandomPositiveIntFromRange(min, max) {
 export function getRandomArrayElement (array) {
   return array[Math.floor(Math.random() * array.length)];
 }
+
+export function createCommentTemplate () {
+  const template = document.createElement('li');
+  template.classList.add('social__comment');
+
+  const image = document.createElement('img');
+  image.classList.add('social__picture');
+  image.width = 35;
+  image.height = 35;
+
+  const text = document.createElement('p');
+  text.classList.add('social__text');
+  text.textContent = 'Ваш комментарий может быть первым!';
+
+  template.append(image);
+  template.append(text);
+
+  return template;
+}