Interesting critter!

He would probably look a whole lot better if he were scanned instead of photographed. It would eliminate any unwanted shadows and paper wrinkles, and probably make the image look crisper and clearer.

I really like his design, though. Call me weird, but in an odd way, he's kind of a cute lil' feller. XD For some reason, I imagine him saying "Meep." Also, you've added good weight to the lines where it needs to be, making his features pop.

Also, unless you were just going with what was on hand, you could experiment with trying something along with the markers (like pastels, watercolor, or colored pencil) to fill in more of the white areas and add a little depth and texture. :3