(Quick note) I start talking like a dictionary auditioning as a person when I get really into something. It just happens.
My first impression of the dragon: It's body is very, very, very lightweight. Practically a tail with a head and legs. Focusing on the head, I belive the dragon has four horns. If you look carefully, the two in darker colors are both on the same side of the head, and shadowed behind them are what I belive to be the horns of the other side. I belive these horns must be flexible, perhaps even antenna, in order to NOT snap, seeing as how thin they are.
The main scales appear to be a shade of aqua, but I also belive them to be irridenscent, due to the range of color glints we see on the scales.
For all purposes, the only way for the anatomy of this dragon to make sense is if it were ETREMELY lightweight. Take the back legs (specifically the left side from our POV) and how thin the lower portions are. In order for these not to snap every time the dragon lands, they need to be very flexible, and the body needs to be extrodinarily lightweight. The forelegs seem to be much stronger.
The shoulder joints/wing joints seem to be the most flexible parts of the dragon. I suspect they can rotate practically 360 degrees, and are also extremely strong to be able to be so small and yet support the dragon in flight. The wing membranes would need to be very thin and very tough in order to be able to support the dragon in flight but not weight them down when on the ground. The wing beats would need to be very powerful to pull up the body, as well. Most likely they have hollow bones, similar to birds, to be able to fly or not be crushed under their own weight. (more later)