Good initial results. And my comments are similar to the first post.
1. First shot: subject needs more light on her face--a reflector would have accomplished this nicely. Or if you're shooting from distance, a fill-flash. Otherwise, in post processing, I'd boost the rightness (which is going to have the benefit of washing out the background even more and reducing the focus on the background to the viewer's right. Also agree about not centering the subject.
2. Second shot: lots of possibilities. It's not bad but you missed some even better options. For starters, on post processing I'd remove the lamppost coming out of the head. Ideally you'd change the angle so it's not an issue in the shot. B&W is going to emphasize lines and form. You've got a couple of attractive young kids wearing horizontal lines on their clothing. Here's what I might have done differently (in staging the shot). Shoot in the other direction if possible--have the kids walking towards to water on what appears to be a pier (no pun intended). As Shaylou mentioned, use the receding lines of the pier to create perspective and contrast with the horizontal lines on the deck and the horizontal lines of the dresses. Also, a viewer's eyes are usually drawn to the white or bright objects...in this case the boots. Depending upon the color in the photo, you may not want to go B&W (or ideally change the boots or at least darken them in post processing so they aren't what the viewer's eyes get drawn towards). I think it would also be interesting to see the symmetry for BOTH girls to be looking at each other as they walk hand-in-hand away from the camera. Just tell them on the count of 3 to quickly turn their heads and glance to each other and then turn back. It will give you some movement in the hair (making the photo dynamic), at this age the girls might view it as a game and look impish, and the mutual glance conveys relationship or connection.