I wouldn't call these portraits; a portrait normally refers to a planned, composed image of one or more people. These appear to me instead, to be candid shots, that is: shot at a moment of opportunity rather than planned.
1. This would be a stronger image with a better crop. There's a lot of empty space above which adds nothing. I would also suggest trying to reduce the highlights on the skin slightly; his face especailly appears a bit hot, and always watch for things like the cropped toes. I think this would have been a much stronger image had you been able to include the his whole shadow.
2. I'm afraid this one doesn't do a lot for me. It appears slightly soft, and the adults fingers in the lower LH corner are very distracting.
Just my $00.02 worth - your mileage may vary.
~John