I'm a HUGE dragon fan, so this art already has a head start in my opinion. The colors, perspective and clouds are all absolutely gorgeous, plus the unusual canine-bird style of the bottom dragon adds a fanciful feel. Two thumbs way, way up!
I like the style you have drawn the picture with. Composition is nice and the background is amazing, but I know this is perspective and stuff but dragon's arm looks weird. Beside that, everything's superb.