/ic/ - Artwork/Critique

DISCLAIMER: I'm not requesting a drawing! This just seems like the most appropriate place to post this work.

I've FINALLY managed to finish this idea I had for an "intro poster" of my characters. This was done on an A3 paper, so it's rather big.
As I've briefly explained in a previous thread, these are artificial beings created by a bio-robotics company for the E.D.F. (Earth Defense Force) to demonstrate the company's capacity to create military-grade battle robots, each bio-robot has their own unique abilities which can be further amplified with the use of wearable catalyst machines.
Although not related to, they consider themselves brothers and are always look out for eachother. The oldest one is Anatoly (20) and the others are a year younger from the other.