The design of the armor is great and you nailed the proportions. The only legitimate thing i found strange about this peice is the hair. It doest have any loose strands or lines within the form to show the influence of the individual strands. also the two overarching masses of hair in the center give it an overall very awkward look.
regardless this is a good piece and I just wanted to share my honest opinion. You are very talented and I would love to see your future works!