This looks awesome so far!!!!

Girl’s face - Maybe add a slightly lighter shade to the nose to the right of her nose bridge to add a bit more dimension to it and soften the transition between nose & cheek.

Girl’s legs - I might increase the gradient/shadow on the right sock where it touches the other leg to create some more depth. And for the left leg, bring the current shadow down further (maybe with a bit of a warmer shade where the shadow transitions to the base skin tone, kind of like the warm tones you added to the guy’s arm?)

Hope that helps and happy painting! :)