Thanks for your comments, guys. I did some more work on it. PT version is a bit dull and not too nice. Sun is too low anyway, and the ambient occlusion makes it very flat. The normal render with sun at maybe 5º (and GI) is better. The 'logs' are just procedural displacements (stretched and rotated, mixed) with glow added. I used a displacement to scalar to restrict bluish ashes a bit to the bottom area, used a color adjust to add some yellow to the centers of the red glow. It struck me that with a line of surface shaders, the second (yellow) glow overrides the first (making the red almost dissappear), so I used a merge shader to add.