Way back in the day when I was a wee lad of about 20 and I had started out learning how to paint, I had this crazy idea of doing an illustration for each of the Lords of the Nine Hells in D&D canon. At the time I only got to about 3, and as I had just started painting, they were not that good.
The images can be found here (One is slightly nsfw):
► Show Spoiler
The arch fiends are as follows:
1. Bel, Lord of Avernus, the First Layer
2. Dispater, the Iron Duke, Lord of Dis, the Second Layer
3. Mammon, The Lord of Greed and of Minauros, the Third Layer
4. Fierna and Belial, Lords of Phlegethos, the Fourth Layer
5. Levistus, Lord of Stygia, the Fifth Layer
6. Glasya, Daughter of Asmodeus, Lord of Malbolge, the Sixth Layer
7. Beelzebul, Lord of Flies and of Maladomini, the Seventh Layer
8. Mephistopheles, Lord of No Mercy and of Cania, the Eigth Layer
9. Asmodeus, King of Hell, and Lord of Nessus, the Ninth Layer
As I'm doing them numerically this time around, I'm currently working on Bel. He is described like this:
"Crimson scales cover this large fiend, from its bestial head to its clawed toes. From its back spread great bat-like wings. Foul green venom drips from its teeth, sending up streams of smoke wherever it falls. Cinched around its waist is a belt of a dozen shrieking angel heads, their necks neatly severed by the massive flaming sword the creature holds in his clawed fist."
So far I've only sketched the basic layerout of the painting down. Next I'll be adding color.