I kinda dig how this one turned out. I wanted a record of how I did it, for the future. I forget things...

1. Basecoat the visor with a pure white like Dead White . Dont worry about being super neat.
2. Paint the recess with Tesseract Glow . Drag your brush from the centre to the outside, depositing more pigment away from tthe light source. Let some settle in any recesses, to get a variety in shade.
3. Take some pure white and paint a small amount in the centre (if that's where the light is coming from).
4. With some thin Warp Lightning , pop just a small amount into the edges furthest from the light source.
5. Glaze some Warpstone Glow around the edges of the light source. This is to simulate glow.
6. Glaze a small.amount of Moot Green only on edges very close to the light source.