I admit that I didn't take proper measurements for the face plate and I now see that the darker chainmail might be confusing. Thank you! 

Seconding Syko. 

Also, I don't think the dithering inside the hole is very effective: it could be confused with the chainmail texture and it gives less depth than a solid darker colour.
The symmetry is slightly off, for instance at the base of the helmet (1-2-1 pixels gives a jagged look at the curve, try 2-2-1 maybe?

Other than that, it's a nice improvement from your other sprites when it comes to texture, keep at it!

Got it! Thanks!

Add some colors to your palette. Grayscale only gets you so far. There are a bunch of tutorials floating out there.