Well since you specifially asked what I thought you can do to improve this there is not really anything I can say, maybe another backround but black, the lighting is very natural here and I can just see this with a barn or something out of focus in the backround. Love the eyes, this is nice work! One other thing, did you use a wider lens than 50mm? If so, I would suggest you backing off and using a 50mm or longer lens next time, if you want to know why PM me :)