Don't let the coloring obsure the drawing too much. The thing with (traditional ) comic-stlye art is that the pen&ink rendering is very graphic. Early comic coloring was very basic and kept with that graphic style (although oftentimes the colors very very jarring in their brighness and saturation). Nowadays it seems that colorists have more control over a final image than the pecilier/inkers because often they render with color. And while rendering with color is fine, mixing that with the graphic pen/ink doesn't work. So I would suggest tryng a more paired down approach to coloring, ala 100 Bullets or Hellboy. This will really let your original drawing shine and keep with th style. On the other hand you could pare down the drawing (ie-no black shadows, simpler lines) and let the coloring really define the picture. Or just forget drawing and paint digitally all the way.
That being said I really like this picture, especially the ink underdrawing. The logo is a bit out of place. Hope what I said makes some sense, and keep up the good work.
Brom, Mignola, Charest, Miller..