It looks very soft and nice, talking about the skin here. I'm not fond of when artists put white on the lightest part of the skin though :<, I think white ruins the tone of the skin as in real life we have no white shining so brightly on our skin (unless you're bathed in oil or something like that).
The boys face looks sort of weird, I think it would have been better if some line were drawn where his eye (hidden behind the hair) should be. Instead of just the shadow, or perhaps darker shadow to symbolise an eye socket there or whatever.
The girls hair looks very light, even the linework of the hair. I think you should have included some of that shiny on her skin because right now it looks almost like the hair is a paper cut our placed on top of her skin. If that makes sense razz .
The girls' expression is definitely the best smile , the boy doesn't look as good as her razz .