While I definitely like the artwork and the graphics, if I were to be looking at this “as a 4x5 on a light-table,” I would have to say that it appears to me to be washed out. Underexposed.
For instance: although you certainly see the creature as “the star of the show,” he’s standing immediately beneath a bunch of white lights. And so, guess what happens? My eye gravitates to the brightest and the most-contrasty elements of the scene. And unfortunately, your little guy is facing serious competition on three out of four sides.
Now, what would I do to salvage this picture in a darkroom? I’d “dodge” the surroundings (to cause them to be darker), and/or “burn in” the little guy to make him lighter. You could, of course, do much the same thing with a little bit of “post.”
Just sayin’ …