I used reflective stickers for the sensors on the head. Quite a nice effect imo.
Here's the paints/mixtures that I am using:
Body red: Fluorescent Pink + GX Hermann Red
Flight-pack red: GX Hermann Red + Cobalt Blue + Fluorescent Pink
Green: Clear Green on top of Star Bright Duralumin
White: White + a little Cobalt Blue
Black: 100% Black
Yellow: Orange Yellow
Inner Frame/Joints: Star Bright Duralumin