I don't want to criticize anything. This is just too good! If I had to point something out I'd say... maybe the clouds could be better. I mean the ones near the lightning bolt just need to be smoother or puffier. Right now that parts LOOKS like it was drawn on, but the rest of the piece you could almost fall into it's so good. I guess it breaks the emersion you otherwise feel with the picture. I don't know, that's all I got.
Nice painting. I like the sense of fantasy. Two things I really find well done is the the sun glints through the breaks in the cloud and the alien look to the surrounding terrain. I am intrigued that the pillars lean inwards - it gives it a different very different look.
I really like it! Personally I think more runes on the stones or details in the clouds could have looked cool but that could be just me. I do want to say the overall 'sketch' style (is that the right term?) adds to the fog and obscure theme. Very mysterious