it seems to be a MOC, but I am not sure that it is authorized (therefore -one star) ...
the bricks are ok, some minor issues with clutch power and there is differences in same color, so the bricks seems to be from different manufacturers, but since this is a dragon, there is no problem with slightly different color of the same tone ...
no missing parts, no bad moulds !
the mounting of the head on the plate and the plate on the foot is slightly delicate and could be more stable, so be careful not to be too rude with it, once it is build, but it is bricks, so you may re-build it as often as necessary