I love the fact that this is underlit and the crooked smile, makes it look very evil!!!
I like it, a lot.
Even though i like your previous works better, this is still one hell of a cool monster.
Maybe its just me, but it looks like the kind of monster that has a tail :P
The shading doesn't seem to be very special, but it works really well, which is really cool.
All in all, great monster.
Thanks!
And yeah, I wasn't quite as happy with the shading on this one as the other, but I think it turned out okay overall.