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There’s this red ambient glow inside his armour where his head is. I wanted my Horus to look like that but wasn’t sure how to do it?

Paint the face a light tone of flesh then you could apply a red wash.

Alternatively you could dry brush but that's more likely to obliterate the paint job details.

Lastly you could install an led light

Ask the painting subforum. They'll hell you a lot more.

To answer the question kinda though, I'm not a painter. At all. However, I remember GW did a video for painting GK weapons and I would imagine the same logic applies.

I've found that to get a good "glow" effect, you want to do a mix of effects. First, you want to stupidly thin down a bright colour for your glow. And I do mean stupidly. You want to look at that paint and be able to run it on a flat part of the model and get pretty much no paint onto the model. After painting your model, you put this stupidly thinned paint into those recesses that are supposed to glow. This stupidly thin paint will fill those recesses, and you'll get the sense that the cracks are glowing.

Depending on the structure of the model, you may need to paint other interior parts as well before assembling the model to get this effect quite right.

After doing this all, you should consider doing a true drybrush effect (dip a destroyed brush in the paint you're going to use, completely dry that paint off, and then rapidly brush back and forth to capture raised areas) to give adjacent non-recessed areas part of the reflective glow.

Do all this, and you should end up with a glowing effect like so:

if the head isn't attached just paint (dry brush) the glow on the top of the armor where the head sits. On the head paint the glow on the bottom parts of the head, attach head. its a very easy osl trick.