To the artist of this amazing concept art. I'm hereto tell you... That this is freaking, absolutely amazing beyond all reason. I have to say the mere Idea of the piece is great,and the style in which to do it is unfathomable. This piece is very inspiring to me, for instance to person in the man second from the left is pretty cool, The character itself reminds me of one of my own characters; which I'll post up soon.
Back to the piece. the composition, is quite amazing, the shading is flawless, and the highlights are perfect . My good sir/or Madam... I must confess that I'm absolutely Jealous of you your work I a master piece, and your Inspiration Is a gift from God Himself. I wish you good luck in your future works
The far left doesn't look like a ground troop, perhaps a pilot of some sort? Or with the screen in his right hand perhaps an engineer?
The next guy along definatly looks like a normal military sort of unit, front lines and weapons. Also the heavy nature of the armour makes it look like it may be able to take a blast and also like it could probably be used in a hostile enviroment, protecting atmospherics, bi weapons etc.
Those first two both look very clean, potentially asociated with the powers that be. The two following look more like they were utalising or scavanging what they could, or that they're a bit more intergrated. Certainly the robotic leg on the forth raises a question or two.
The third from the left looks quite intimidating in the helmet, and some other aspects. But it also looks like it's seen a few repair jobs. The machette seems like an oddity next to all the high tech around, a rebel unit? Or a unit for fighting in close quaters an ambush? Either way it feels like it's a less technocligcal approach than the first two.
The last just seems odd, first there's the gun that he's leaning on, which seems not to be built to be held like a traditional gun, I'm actually interested in how it would be utalised. The limbs on this guy seem out, which I'm imagining is intentional as the others seem perfect in this respect. There aren't eye slots as much as there seem to be some kind of sensors, presumably relaying to an internal screen. The implication from this one seems to be a more hybridisation with man and machien and certainly a higher reliance on technology. Whilst that technolgoy looks powerful and fear inducing it seems less ordered and probably less subtle, lots of strength less finess.
On the whole I really like the lot, I find the level of detail you've used draws the eye to the details and makes the figures seem quite real. I think the poses give a good indication of the people and the armour gives a certain differential between the roles included.