Zelda-type area: fire theme

I’ve been working on this for an hour or two, see what you think:
I don’t intend to use the game engine for this or anything, it’s just a location I’ve made for a story I’m writing.

I haven’t given it a roof so that the camera can see the whole thing at once.

One thing I’d like advice on is the lava. I think the black texture is too overpowering, but I need it for realism. Any comments?