1: Part of me likes the shallow DOF and part of me wishes there was a lot more DOF. It's a good profile, in my opinion.
2: That looks like some pretty harsh lighting to me. There are several blownout places. Great photo otherwise.
3: The girl has a great expression, but the shadows on the woman's face bother me. Also, the girl's face is almost lost in the background due to more harsh lighting.
4: Definately a keeper, in my opinion. Both have natural-looking expressions and you can tell they really care about each other.
Overall, nice series. 1, 2, and 4 are all really good.