Tip: work on 1024x512 - this'll help with correcting proportions come 'sphere time'. (Face is still wide)

Make the wings on the side of the helmet longer and or taller - right now they just seem like an odd decoration.

Again, work on 1024x512 - or work with 512 to make shapes spherical when they should be. With 512x512 you need to make the sphere skinnier, while with 1024x512 the shape will not be distorted. (pupils +iris are circular irl)

Beard (jaw) line is too wide.

Eyes are too wide.