They are very good shots. The shadows have been mentioned, but I actually like and use shadows a great deal. If done correctly the can be a great asset to a photo. Have a look at some of Alfred Steiglitz's photos and use of shadows in portraits.
To my eye what seems to be missing in both is a more expanded grey scale. You have great white's and blacks but the middle ground to get from one to the other seems to be lacking. IMO.
Terry