It's already very good, I have little suggestions to make. Maybe add some bump to the hair texture of the woman for some extra realism. Also the skin on the guy's neck seems a bit strange, maybe the texture should be rotated slightly more towards his left side. If you turn your head 60 deg towards your right shoulder the skin won't rotate the full 60 degrees, it slides a bit and is actually still a bit more to the left then the head. It's just like with your hand, if you keep your fingers stretched and then bend them down and you look at the skin at the top of your hand you can see the skin slides a bit over the knuckles, I think the neck's skin texture should make a similar effect. But as I said it's just minor detail nit-picking. You've already done like 100 times better then my best try so far :)

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