When writing I’m often inspired by images I see, and one image that stuck to me was a digital artwork by Tomas Honz on Deviantart called Inferno:
The Inferno (with a few small tweaks) was the perfect visual for what I wanted Tartarus, the prison of the Greek Underworld, to look like. The artwork radiated with heat and danger, which was perfect considering the description I had just written for the place.
For more awesome artwork, I would recommend you check out Mr. Honz Deviantart account and website.
(aka The Very Impressed)