With such personal photos, it really doesn't matter whether we like it or not. But with that being said, I think its really good, and the color is EXCELLENT. I don't think it would necessarily be better with his eyes open, but I'd like to see you do another shot of this same style someday when he's doing just that. But the closed eyes in this one make him look more innocent.
BTW, did you darken his eyelashes? If not, then leave it, but if its possible to lighten them up a bit you might. But this is insanely nitpicky, the photo is 99% excellent (better than any picture I've ever taken, and I mean that).