Pretty girl and nice shots!
You didn't say if you wanted C&C, so if you don't, let me know and I'll delete the rest of this post.
In the first pic, I do love the composition wit the tracks; you could have tweaked it slightly so that the tracks are not coming out of her head and also so that the tracks fade end at the edge of the frame rather than in the foliage. Doing that would eliminate the foliage and place her further left in the frame.
In the second pic, my nit-pick is a PURELY personal bias so take it with a grain of salt. I just don't like the whole tilted camera thing. In this image for me, it just feels a bit... unbalanced and wrong. I love the pose and the composition. I find the little bit of the concrete wall or whatever poking out in the bottom of the frame to be distracting.
Both are well exposed and have great skin tones!