That looks cool. However I would go lighter with the hair colour with the final paintjob. In any scene in natural light in T2 you can see his hair is a lighter shade of brown - like you've got Dutch actually.
Hmmm, I disagree bud, looks great here on my monitor. If it were to change, maybe somewhere between Dutch and T2. The dutch hair is too light for T2 Arnie IMO. It definitely does look lighter in some scenes though, Enrique's camp etc.
Still floored by these sculpts, especially the T2. Great work Creg.