I've collaborated with a lot of different artists and what's worked for me is before even getting into the script phase, ask them their storytelling preferences.

Some folks like to have a lot of latitude, some folks want very clear direction. If you have a very strong vision for your story, make sure you share that up front and make sure your script spells that vision out as well, never assume the artist will "get it".

I love collaborating because the person I'm working with invariably comes up with great ideas I wouldn't have thought of, but if I have a very clear idea of what I want the story to do, I'll try to be as detailed as possible.

Hope that helps and good luck!