Very nice! Excellent smooth movement on the legs and wings! The head issue's been addressed, but I think there's something a little off about the tail too. I think it's not quite having the followthrough effect it should- it looks like it's moving on its own rather than its movement being created by the hips, particularly in the middle of the tail.
Very nicely done! The only critique I would make is that having both sets of legs/feet leave and rejoin the floor in unison gives him an almost 'row boat' movement. Most animals set their hind foot down before removing the forefoot from the floor. As for his head, remember to bring it forward and down when his front legs are extended such as when he is about to set his foot on the ground.
I hope i was clear, its hard to explain lol i love how the head moves back and forth with the movement of the neck but how his head seems to look up and then down in a jerky motion like hes nodding 'yes' is the motion im pointing out. lol im bad at explinations
your animation is just amazing though i so love it!
im no expert at dragon walking anatomy but if i had to say something it would be i do not think his head would move as much as it does. I believe his neck would act more as a shock absorber type deal and he would keep his head more or less level and still. maybe some movement, but it would be slight. not as exaggerated as it is here. only my opinion, not a professional opinion so take it with a grain of salt.
other than that, this looks frekkin amazing and im mesmerized i love to watch it!