A couple of versions ago I introduced a setting in #Conversations_im to hide the avatars next to message bubbles.
I'm personally not a big fan of the look, but it does bring it closer to what Signal and Google Messages are doing.
The next version will split that out into two settings: One that controls the avatar on received messages and one on sent messages. (Indicating what account is being used.) Hiding only the latter is a decent compromise for those who use the app with a single account.