Base coat the canopy glass using a 1:1 mix of Gal Vorbak Red and Doom Death Black
Shade the deepest recesses of the canopy using Black Templar
Starting the top left corner and working your way down to just above the bottom right corner, apply a very thin coat of Gal Vorbak Red
Repeat the previous step, staying nearer and nearer to the top left corner with each step using, in order: Khorne Red , Mephiston Red , Evil Sunz Scarlet l, and Fire Dragon Bright
Using a thin coat of :Citadel/FireDragonBrighor, paint an L shape in the top left corner
Repeat the previous step, this time making the L much smaller using Flash Gitz Yellow
Apply a single dot of Bold Titanium White in the top left and bottom right corners