I love helmets and heads like this, with no eye holes or cameras, makes it look even more high tech, like the inside has a hologram visor that makes it like not wearing a helmet at all. You have fantastic art.
Wow, these are some pretty nice brushes. I'll have to use them the next time I work in Photoshop. Also, just wanted to mention that this picture finally gave me some inspiration for what to draw (it had been driving me crazy for 2 hours before I saw this). Thanks for the response!