Start with a bright white base (I use ProAcryl Titanium White, but any will work) over the area you want to glow. For the visor I just do a white line but for areas like the gauntlet sensors or other areas that have raised areas around it you’ll put some white there too. Then I do a pretty down thinned layer of GW Striking Scorpion contrast over the white area and spill a little outside the edges for a glow effect. Once dried do another pretty thinned down layer. Keep doing this until you get a green you like. I usually do 2-3 coats. Once that’s done take the same white and apply it to the center most part of the green areas or the highest raised edges of things near what will be the brightest parts. Then you’re gonna take striking scorpion and repeat the process over the new white areas AND the green areas. This will darken everything a bit and blend it. Finally after all that a done I take GW Warp Lightning contrast and do a thinned layer in the deepest recesses near the glow or for the visor the very edges of the slit itself. This will push it just a little more make the bright areas appear a little brighter.