My thoughts on the art direction. (this wont make me popular.)

[Mr. Mask]

So im quite enjoying your game, but im concerned about the art direction and what it might evolve into.
Im not looking to make your game serve my personal fancies, but i feel what i have to say could be useful. Maybe i can even find someone who shares my opinion, you never know.

The very core of what im gonna say is, dont go anime on me. That statement has nothing to do with the japanese art style by the way. What im saying is, please let the world be ugly too. Dont let your characters devolve into fairy-faced magazine models, dont shove six-packs, rippling biceps, thunder thighs, or granite buns in my face. And no skeletal, balloon chested, doll-mask chicks either.

I make that sound very demanding, its obviously your game in the end, but id like to see a small revolt against these pedestal-stereotypes that so many franchises peddle. Because they are incredibly boring, Not at all visually engaging.
Your artists did not draw slim, smooth-skinned, streamlined figures in art school.

Im basing all this crap on these concepts:

There are two, VERY slightly varying bodytypes here, a male and a female. I see the underlying strokes of this, And i think theyre good, and i declare that you can do better.
Even technically, its not unthinkable to have a dynamically varying body shape.

[Nadrynne]

I can see what you're saying and I think it would be nice to see more body types but besides that I actually think the GoI character art is actually really good.

I've been very grateful not to see scantily clad bikini wearing gunners or engineers or any other ridiculous stuff you see in other games. There's no boob or thong armour or any of that. My characters actually look good and well dressed - they are not someone elses fetish. A lot of other games cannot say the same.

Infact one of my favourite outfits is the default gunner/engineer/pilot blouse and waistcoat. It looks really fashionable.

[RaptorSystems]

I imagine part of the lack of variety has to do with optimisation in regards to the physics engine, etc.

However, good point.

[Lord Dick Tim]

I can't speak for the artist, but from what I know about making concept art, and producing it expediently, is to make a couple of base models in one layer, then paint the concepts over them.
You'll end up with a generalized physical quality to each drawing, but get the point across for the aesthetic differences.

That's the point of the concept after all, a generalization that touches on key differences without consuming to many resources in time or material.