looks great. Now to take it to the next level:
The basketball hoop is just stuck in the lava but doesn't really look like it: it needs a shadow for reference
the lava should produce fire in other spots and not just the feet, that would make it look more natural, like the kids are in the lava, not on top and with their feet on fire.
The lighting needs to match more correctly. You need more dramatic lighting on the kids to make them match the background more. After all this is a very dramatic feeling poster.
The text is nice, maybe incorporating it more into the picture could add an extra touch, instead of text then pictures. And the names could be placed on the bottom of the players.
You can always shoot me the files and I can whip something up quick for example
I love this stuff.
Keep up the great work.
Adam