This should be an interesting one, it gives me a chance to do some heavy hard surface modelling rather than the usual organic stuff. While I do really like main guy in the center I dont particularly have a plan for the overall look, I done a bunch of similar 'armour' work on a project a few years back and it really lends itself to experimentation. If there is anything specific you like about any of them chuck it below and I'll try work it in.
There was also a bit of talk both here and in the discord about potential hand/weapon/head swaps. This should be fairly simple if we are clever about it - take a look at the 2 guys on the left, it's an almost identical pose but the weapon orientation makes a big visual difference. That's a pretty easy and fast change to make to get some more variety out of the model.