Both excellent images, however in #2, it's not the strand of hair that bothers me (I see that as typically child-like; after all, this isn't a fashion-model) but rather the background to her immediate left. The fence panel is focused enough that it seems distracting, and I think a slight change in your shooting position would have eliminated this. As well, watch for 'things growing out of heads'. In this case, it's off to the side, and softly focused, so not a major issue.
First photo, careful of things chopping your picture in half, like the tree. Second one her pose is a little distracting. The knees are drawing too much attention. Cute girl and great coloring!