Thanks for all the comments.

I'm now reworking the hair near the forehead, darkening shade on the nose a bit, fixing the collar bones, modifying the shoulders, trying to fix the light source and other minor changes.

Also, working on the rest of the body, which presumably would create more stuff to correct.

WiP.

Damn son. What modelling program?

My initial critique is that it looks unbalanced somehow, like the feet are not large enough to balance the body without some serious difficulty.

fff-

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Tell that to Keith Thompson

Jon: God Damn love this thing. It's armed to the teeth, yet slightly cute.

Why the turbines are sucking in the hot air from the front of the gun is a mystery to me, wouldn't it make more sense if it sucked in air from a place where there isn't hot gases right in front of it?

Those are ammunition canisters, not turbines.

I've never seen any form of ammunition storage unit incorporate fans before

That's because cartridges should be stored in a cool and dry environment. The dehumidifier is missing.

using your style as an excuse to half-ass is the refuge of the bad artist

I spend a significant amount of time on DeviantART. I have heard this exact same thing many times.

It's utter bull♥♥♥♥.

Proportions?

I'M TALKING ABOUT FACIAL STRUCTURE!
You want it to look human... don't you?

To be honest I don't think many manga/anime characters look anatomically correct, because it's clearly not what they're aiming for. The question should rather be if the style appeals to the audience. That's it. And that's what I want to know.

It's just that your face looks off, even for a manga character. I think that's what people are trying to say.

Which parts do you think so? I'm now modifying it.