Very nice. I really love Shepard's expression. But I also agree with those that have mentioned that the hand and arm are a bit too human - and the shading makes it look like a different a different skin type and tone, as well. Unless that was the desired effect? Another one of your Thane/VA juxtaposition pieces?
But the rest of us know better. You may still be learning/improving (people always are); but you're still very skilled. Striving for improvement is what makes people better, and knowing that you still have room to improve is what makes someone really great. ^^