like hydronium said, there isn't that consistent of shading.  The general  shape is well done, and the blood is pretty good too.

The evil, uh, evilthing should cast a shadow on the ground. If the moon is behind it, its back would be highlighted while the stomach would be more shaded, not the other way around. Since the shading on the skull suggests the moon is the main light source, the evilthing should have shadows according to the moon.  Maybe make the moon more textured as well, but the smoother look seems to fit in well enough with the rest of the piece.

I like how you did the blood dripping off the sword, looks great.