A very nice capture. Does not come off as candid. He appears to be anticpating the shot, however the infant could not and the expression is the redeeming piece in the challenge validity. Some backlighting here would go a long way to adding points on the scale. The older child's hair is lost in the shadows and it would be nice that it not 'seem' that his head is cut off where the hair begins.
I see nothing else in the capture to speak on, but would like to offer some post procesing ideas if you have the software. A slight dodging in the whites of the eyes on both children may be something to play with. I think this would enhance the beauty of the shot. A great wall hanging for the family as is tho. Bumping from the 4 place holder to a 5