This was originally just going to be a quick sketch of the Master Chief's helmet on a blank background. As you can see, I got a little carried away, and this is the result after a week of off and on work.
I hope you enjoy!
EDIT: Some people made the observation the helmet was originally too elongated, which I agreed with. I shortened it down, so it should be more proportional now.
Freshly deployed from a D77-TC Pelican Gunship, Master Chief Petty Officer John-117 prepares to back up the UNSC forces, who are currently engaged in a losing battle against a mighty Covenant invasion fleet.
When the ground commander called in for reinforcements, I bet he didn't think they'd send a Spartan.