Blocky halo helmet
I think the best fix for mirror drawings is doing the lightsource from a side instead of top or any middle point.
That way the left side will be shaded and right side bright or viceversa, thus hidding "the mirror effect".
Anyways, I love the idea of the design, and the highlights on the glass; it looks great overall.
Be careful with using mirror to draw objects. You can sometimes get a disconnect form the right and left sice causing it to look a bit blocky or squashed virtically.