Hi j_c. Mostly I see three things to comment about this picture.
1) Very cute kids. It's always nice to have photogenic subjects.
2) Watch the composition and try not to cut off fingers. Being a little further away would have kept all the fingers. (The head would have also been included too, but that is okay as it is.)
3) The skin on the boy looks to me like it is almost blown out. There may still be details in it and it's not that bad, but just something to keep in mind.