Great Color Scheme!
There are loads of colors in this piece and they all pop fantastically. I'm assuming everything in this picture is apart of the monster's body.
Your color choices make the picture, for me at least, look like a tribal, or nature, theme.
This picture doesn't belong on a black background, try to experiment with other colors. The black backgrounds takes away from this picture.
The colors in the face of the monster should be much more saturated so they pop out of the drawing more. At first, I didn't know it was a monster until I clicked on it, zoomed in, and found its face. It's not that big of a deal, but it's easily fixable.
Overall, you have a really great piece of work here and I hope to see more from you. :P