They won't be used commercially, nor will I seek to gain from them in any way. I'm no company, just a single person. I only seek these pictures because it makes me happy to see my characters exploring and whatnot.
I guess I should also include that I may print these out for the wall, so that's the real extend of the picture's use. All credits go to the artist. ( I encourage a signature or watermark in the corner of the picture.)
I know, this is probably pretty lame compared to what you guys expect from a client. Hahah.