Mmm... are you sure you're not being a bit overambitious here with that huge canvas?
In any case, that sort of stippling-technique you're using with individual brush clicks in the background probably isn't going to get you anywhere, if you keep paint-overing it over and over :V
As for the dragon... I'd be hard-pressed to think of a swiping technique that involves doing a mid-air barrel roll and exposing your vulnerable underbelly to the thing you're swiping at. If you're trying to express dynamic motion in the composition, perhaps you could reconsider the dragon's design entirely.