This was the finished posture I came up with. I was happy with the speed and the weight of the dragon.
I made the practical choice of supporting the back end of the dragon with something. At first i thought a building would look rather neat, but decided against it, as it would take too long to do. At the same time I wanted the dragon to be the main attraction of the piece, hence a tree was needed! It would also lend some menace to the dragon, if the tree were to be split in two by the tail of the creature.