@catsgamesandpizza Thanks! Sadly I don't have photos but I'll do my best to explain what I did.
I painted the Red (just a mid red with a red wash over the top) first, partly because I only decided to do the Flicker glow afterwards.
The green was primarily two colours, from the citadel range. The deeper Warpstone Glow, and the bright Moot Green.
I started by coating on a fair few layers of very thin Warpstone Glow. It didn't blend too well with the red, so I suspect there's a better way to go about this bit.
I did put a coat of Ork flesh contrast paint on it, but not sure this has actually affected the final product at all so probably not an important step.
I built up the blend by just mixing the two paints starting with a mix heavy with Warpstone glow and adding more Moot Green for each grade of the blend.
Each Grade involved a couple of thin layers,
Eventually I painted a layer in just Moot Green.
I gave it a coat of Thraka Green wash to get some shading in without knocking out the actual colours (Do not use a contrast paint for this oh boy I have learnt that lesson!)
Finally I finished it up by mixing a little Golden yellow (a very bright yellow) with the Moot Green to make a final tone.
An old lecturer of mine on my concept art course taught me that if you want something to look like a glow then shift the hue a little on the brightest colour. Move green to yellow, or blue to teal or purple etc etc. Helps it look like it's got a bit of light to it.
Hope that makes sense and helps!
Also that IS a beautiful red on the Nephilim!