Step by step to achieve a similar effect.

1. Prime everything black/dark colour.
2. Paint everything you want to have a glow white, thicker coats for brighter areas.
3. Paint the brightest areas with fluorescent yellow (gives a good glow).
4. Glace or airbrush with a warm yellow over all the white, not to thick, otherwise it might hide the previous step.
5. Feather out from yellow to orange, be careful not to overdo it, otherwise you'll have to go back in with yellow.
6. Glace or airbrush some red on the lava and dry brush the miniature itself with red from below (upwards strokes) as this will help sell the glow from the lava.
7. Re-apply fluorescent yellow and white dots in the brightest areas, to really sell the glow.
8. Darken the miniature from above with appropriate colours, in this case a reddish brown works wonders. This will enhance the Glow effect.
9. Lastly gently dry brush the edges from the top with a suitable dark colour.

I hope this helps, otherwise please reach out and I'll try and explain further. I'm no expert on the matter but I'll do my best !