Tiamat - Queen of Dragons

I've drawn enough versions of Bahamut, so I figured it was time to draw his evil counterpart, Tiamat, five heads and all. While I drew Bahamut to be a majestic brute, Tiamat, being the evil counterpart and all, was intended to be a tad slimmer and slippery in comparison, though she is still ungodly in her own right. The tail... I just randomly drew a shape there and left it as is. Otherwise, for the most part, I liked how she turned out.

No references used.  Used 7H, HB, and 2B pencils.