Re: Another question
Okay, I can answer that second one straight away--if you were an author and an artist, you could create a story and a companion piece of art or combine a piece of art with a companion drabble/ficlet. Or if you were an author and wanted to collaborate with an artist and put the art and story together for the same prompt, that's totally cool, too.
The one about two prompts going into one piece I have to confer with the other mods about, but I'll have an answer ASAP. :D