My favourite part of the art is the head and neck of the dragon, the sky and especially the cloud they look amazing.
My main complaint is the dragon doesn't look to be flying at all, he looks like he sat down and there was some gas leaking around it. It reminds me a lot of the twilight and mordecai airplanes image, with the way he is sitting.
I know he is meant to be flying but those proportions feel really akward and the good clouds and background really don't save the art, though they absolutely make it better. Next time please spend more time on the proportions so the art can truly shine.