Is is possible to get a BLU version? But I guess that would be more work than simply color-swapping the characters' team colors, because the background would have to be changed as well to show the BLU base.
Great composition, and I love the "nostalgic" background effect.
The only thing that I noticed is, Soldier seems slightly, very slightly, too large compared to the other characters, esp to Sniper and Heavy. He should be smaller than Sniper, Demo and Medic. Maybe because Soldier is standing slightly higher, and in front of Sniper? I don't know.
The posing and the background effect are really well done. You really should work on your cutouts for the greenscreaning, though. The green line around each character is very noticable and is distracting.
Well i'm pretty sure Soldier was born on a different planet and lives mainly on Cat food because the sentinent species 1up from him won't allow him to fly up to the big ass spaceship above 2fort to use the space weapons ;D