It a brightly lit abstract background along with tattoos on your character in bright strong colors, it was trained on v1-5-pruned-emaonly Best results are with the v1-5-pruned-emaonly model.

You can get some unique results when used with realistic models and changing the sampler.

use term "elaborate and fiery bioluminescent "

You will have to play with negative promps, I don't use any to get unique tattoo designs and some limb results are pretty cool.