The face is kinds good. I'm guessing you're going for a sphinx type of thing. I suggest you continue using the same color scheme and make it look really sand/stoney like.
im triyng to skin the other version at trhe moment ( the flying one ) and i can tell u the face is a real nasty custumor.
it looks good so for try to do what the other told u and also ad more color variation and detail but I m sure ur working on that.