First of all I like the concept of the images.. but for the first one, it could be just me, the hair that is near the top of the head is too much, it has to many shapes and makes you think of something else then flying hair. For instance (I hope I am not being mean) I thought it looks like a hand coming out of her head. The background is great in the first image it might need a little more negative space but it is well done. The second pic has a great image but the background is to open it needs more shapes or negative spaces (maybe use the rule of thirds, maybe), other then that it is fine. Other then that like I said they look great.