Nice picture. The only problem I have with it is the boy on top. The side of his head and his right foot (Our left) stand out for me and could look a lot tidier. Maybe I'm just picky though.
I'm guessing you've taken these pictures and then deleted the background from around them. This just doesn't look right to me, not crisp edges. the lighting on the boys looks great, but the edges spoil it for me. Have u got the original without the deleted background?