Hi here is something I did in Photoshop today. I'm just practicing painting flesh tones and hair. I wasn't to happy with the hair and I'll make a more realistic painting next time around. I was not too concerened about proportions here. Let me know what you think. Thanks.
Alex
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Also flatten tones out where you can, try to avoid the splotchy look (like on his forehead) which is making it hard to determine depth and form.
here are some thoughts on what you mention you were playing on.
skin tone:
try playing with adding texture to your skin tone's hue (splotchy yellow and pinks for peachy skin) and adding wrinkles, hair, and freckles - which skin is notorious for having on it's surface.
hair:
use a smaller brush, using an underpaint of medium strokes, paint-in individual strands of hair.
you can also build contrast with your brush edge; adding hard edges in the mix of the soft.
corners of the mouth ideally line up with the center of the pupils - it can be a useful landmark in the future. being concerned about the proportions wouldn't hurt. nor would concerning yourself with the composition.