Update EIP-3074: update diagrams, add delegate use case

EIPS/eip-3074.md

@@ -245,6 +245,10 @@ Using `commit` as a hash of values allows for invokers to implement arbitrary co
 
 ![multi-call auth message](../assets/eip-3074/auth-msg-multi-call.png)
 
+Another interesting use is to delegate control of the EOA to other key(s). This would mean the EOA signs a `commit` message with the address of the key(s) and an access policy, if applicable. When the delegate wants to make a call as the EOA it will construct a signature over the invoker-specified call format and relay it (with the actual call data) onto chain with the signature and commit that granted it access to the account. The invoker will then be able to determine that the EOA has allowed this alternative key to make calls on its behalf.
+
+![delegate auth message](../assets/eip-3074/auth-msg-delegate.png)
+
 
 ### Invoker Contracts