Exposition Dumps Can Work

One of the secrets keep in mind is that as a writer for a visual medium there's a lot of rules that don't apply to you that would definitely apply to a text writer. One of these is the dreaded exposition dump, where a character goes on and on and keeps talking about everything's going on. Or when the author decides to just say, "Hey, here's what's going on." 

However, as a visual author you have major advantage: Whereas a purely text writer is limited to simply telling, you can show it and you've got multiple ways of doing this. You can obviously use a flashback; the art flows into a sepia tone and you simply show everything that you're trying to tell. The flashback also allows you some commentary on the particular situation that you happen to be showing. That is, you're not limited to a simple third person showing and are forced into some sort of omniscient narrator; you can actually have a little bit of fun. The character can make a point that is from their perspective. 

You can also use framing tools. If you have a conversation going on, in the background you can show the events unfolding. You actually show the two characters reacting, be showing some emotion, throwing a bit of commentary into the flashback. 

You need to realize that a lot of the rules that apply to a text writer don't apply to you as a visual writer. You have some fun ways to make execution dumps work that they don't have access to, so take advantage of that. You can show when they have to tell, and that's part of what makes a comic book writer so much fun. Keep that in mind when you're stuck and things will go a lot easier.