Head definately needs more things on it, more shading and flow, trying adding more detail and such, although it's a nice idea it could do with some speciality to make it different from anything else. For example, add more dark purple and dark grey bits around the head to give it some highlights.
Left thigh is very good, I couldn't be happier with how that is, it's a bit busy but at the same time very controled.
Right thigh isn't as glamourous, add more dark purple parts and dark grey parts, that will make it twenty times better.
Not bad all in all, but could be a lot better. 7/10.