It's beautiful but Life is what you're after in this one. Try giving each one a personality.
Though this is ruddy difficult in full suits, can one have it's mask off?
Other things to try to bring to the fore
Different stances: All of them seem to have their feet exactly the same, can you change some whilst maintaining a realistic sense of balance?
Arms: Get one of them scratching his head :-)
Suits: Can you have slightly different colours/symbols or chuck some muck/damage on them?
Weapons: Though it may take a bit more work can they carry different weapons ready to 'roll out', lol
I like your sense of depth in the picture and the head torch effects are really good, chuck a few other things into the mix and you'll have something good :-)
So, where will your imagination take you today?...