If you're going for a pose with one leg raised from the floor (as in the first pose), then I'd recommend also posing its tail somewhat too. It should whip around to the side opposite to that foot which is raised, during the raising, then as the Dino's weight shifts to cycle through the top of the stride, the tail should whip back to and through the center to help pull the hips back into alignment for the last part of the cycle.
I'd also be tempted to put a little motion blur in there too to accentuate the impression of movement.
... just my $0.02 worth, although its looking pretty darn good as it is so far...
