Hey all I'm a long time GITS:SAC fan, and I'm trying to land a job in the games industry so I thought I'd combine the two and create my own rendition of loveable old Batou.
My reservation is the face looks a little too 'old' and craggy. I know Batau has pretty rugged looks, but don't forget hid body is artificial, so it doesn't age. I'd probably smooth it out a bit, not totally, but just so it's more 'rugged good looks' than a bit of old age? Might just be me, I just expect his face to look a little younger.
Your overall style fits the subject perfectly otherwise and the overall effect is excellent.
I'm sure you researched it very deeply but here's a few pictures I found: