Peter, here is my effort. Hope this helps.
Critically, I took the tiredness out from under his eyes with the patch tool. With children it is easy to find good replacement skin of the same tone and smoothness. See the difference? I also patched above his lip to loose some of the wet from a runny nose. I used a high contrast curve and put a blue cooling photo filter on it to bring the back ground to life and lower the skin tone. A bit of burn and dodge to bring his lovely eyes out and finally I put an inverse feathered guassian blur around the child and the arms, plus a small sharpen. On the first example I added a glow, always nice with children.