Hey, this looks pretty good! There's a few little problems with proportions, and also the geo in places could be collapsed/ redirected... Nothing too bad

I was working on Low-Poly characters for awhile, about 8 months ago for a small Unreal Mod that died (sigh..) , but anyway.. during that time I collected a bunch of references form, wire frames images of models, to photo references, to orthos. So let me know if your interested, and I can zip some stuff up for ya, and send it your way!

Anyhow, nice work so far!