Hi Steve,
Fantastic effort for only your second figure. I have a couple of tips if you're interested.
Firstly, I'd reduce the amount of white in the eyes by closing up the lower eye lid and adding a bit of red to the inside corner of the eye. You can do this by painting the lower eye lid in your flesh mix colour, and then add a very thin and dilute amount of red to act as the border between the eyelid and the eyeball. This will help to reduce the zombie stare effect and give the eyes more character. In fiuture, rather than use white to paint eyes, use an off-white colour, and save the white for adding highlights and catchlights to the eyes.
As for the helmet, I'd leave it unpainted, but just add a thin wash of black/ brown around the rim to give it a sense of age and depth.
You've set the bar very high with this figure Steve. With such a strong debut, we all expect to see big things from you in the future. Keep up the good work.