That was actually not the one i was thinking of. I thought I remembered a couple of poses being the same, but I was wrong. Anyways, the concept (even if it were a complete copy) wasn't very strong anyways. The bullet strikes from the turret are not in line with the barrel, the way the closest blue spartan is dying (?) doesn't make sense. he looks like he's wall running. What is the one next to him doing? Nothing is sharp. If anything, the red spartan should've been painted a lot sharper than anything else.

Your little lake scene there (which looks like some kind of futuristic kohler faucet surrounded by crushed yellow napkins that turn to ambiguous yellow chunks) looks like the perspective is pretty borked. You missed the material on everything.

The biosuit looks alright but the chest and abs part looks like something with big eyes, a nose and 4 huge teeth. i would suggest following muscle groups if you're going to make it look like muscles. This one actually has decent symmetry. The way you use light and dark though I'm not sure if you're trying to simulate a gradation or muscle striations, but it does neither. it makes the surface of every part look really playdough-ish.