Quote - I don't know if this will help you UHF but I did this one using only bloom in Reality.

I just lowered the amount and radius until it looked right.

Very nice... although if I could suggest that the bloom works so well because it's in front of a black background - it would soon disappear into the scene if there's a relatively normal amount of ambient light in it. That's not a detraction from your cool image in any way, just comparing to UHF's original image, which I feel is generally too bright for a rendered glow that would get noticed.

There are a couple of easy things you can do in post using layers -

1. new layer - paint over the area you want to glow with whatever colour you want the glow to be - apply gaussian blur to painted layer (usually something between 5 & 10 is enough to spread the edges as if disappearing into the surrounding area, but of course, set as preferred) - reduce opacity of painted layer to level that works for scene.

and/or

2. copy area(s) of render you want to glow into a new layer - adjust settings of new layer something as follows... brightness -60, contrast +60, saturate -60  ... next apply gaussian blur - set layer property to "screen" - adjust layer opacity to suit.

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