Good:
+I like the sense of movement and violence with the fireballs.
+It's certainly a chaotic and hellish picture.
+It looks like it would work well as some kind of board game background.

Areas for improvement:
-It's hard to see it as a map. There's no sense of scale, no familiar objects with which I can put this into perspective. Are the rocks big enough to stand on? Are they the size of mountains, like the floating ones in Avatar?
-Some shadows might help to establish and reinforce which way is up here. The configuration of floating rocks is a bit disorienting.