Deep in the Underworld by dark-spider
My own version of Hades & Persephone. In the picture I portrayed they both, with Cerberus. At the left we can see Charon in his boat and the river Acheron, and in the other side the river Phlegethon, made of fire.
There's a step by step of this one here: http://dark-spider.deviantart.com/art/HyP-Step-by-Step-70017332
Done in photoshop.