Thanks for the very kind comments, one and all.
Tim, that's a VERY kind compliment indeed - and I'm far from convinced it's in any way deserved!
But I really do appreciate your thoughtful comments about the shield. I agree she looks best in that three-quarter view - I think it may be because her eye sockets (and the bridge of her nose) look darker in the other shots. I have wondered whether I should lighten these areas a touch? But then, in the three-quarter shot the colouration is fine, and in the flesh she looks good from all angles too. Again, I must emphasise - to myself as much as anyone else! - that I'm painting this to be viewed for real, not on camera.
Re. the shield - I'm definitely not going to use much metallic paint on it, and try to keep my palette relatively pale to contrast with her dark face. Still undecided on actual colours though. Omit it? I don't think so, although I can decided once it's painted up.
Thanks again for your interest, folks.