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She's looking really good ^^

Black hairs (at the left side of his face, from our point of view) are looking strange.

You can try Hue/Satruation + Curves to adjust contrast and brightness.

I like this picture (colors, centring).

You did a good job.

The first girl's right leg seems to be shorter than the left one, no ?

Good job man, it's is very detailed.