I agree with pisto1981 about maybe reducing the highlights brightness of the first and third shots. In the second shot, her hands look a bit too bright for my preferred taste, but it is trciky when woking in that type of semi-shaded area...still, I'd like to see the faint shadows a bit darker, and her hands a bit darker too. Just a little bit though. To my eye, these look a bit over-sharpened for the web.
I am not a fan of the off-center placement of the girl in #2 because of how it affects the overall picture, the overall scene. With her placed in the right hand third of the frame, the tree and its sunlight-dappled roots behind her draws a huge amount of visual attention. The bright spot on the ground is actually the brightest object in the entire frame. An alternate approach might have been to move three or four steps to your right, then aim the camera at her, and put her face in the left-third of the frame, and include the chair she was sitting on, and in that way, entirely block out those tree roots in the sunlight patch, but still include the three tree trunks. In that way, you would still have the pretty semi-wooded, park, three trees + creek naturalistic background, but also show her in a sideways seated chair pose, which is usually cute on a girl her age.
Your first and third shots have simple, non-distracting, naturalistic backgrounds, which is good.