It's kinda cool but have a wrong value separation, there's a very short distance in value between foreground and background and this makes your painting a little weird to look. All that lava though it's a primary light source and it's kinda strange that is so opaque.
Hey there, nice pic. I like the concept and stuff, but I suppose you want some useful feedback so here's my two cents:
I agree about the lava being too opaque. The flying rubble is kind of weird too. Did the golem throw it at the warrior, is it falling from the rock above or is it from the eruption? The warrior isn't flinching so I guess it's nowhere close to hitting him. It seems to be falling at a weird angle too. If that golem is in the distance, then I think he shouldn't be as bright. I also think the shot is too far away from the action, maybe moving a little closer could help.