Wow, you guys are already trying to catch vets? Even WE are struggling with that. You know, you should have allowed inters to joint there.
Back to serious; The joint itself is well animated, but the flashing is, wellllll.... The .gif seem to be shrunk which could have been easily resized to fit the canvas, and there was no background to make the video more interesting since black empty background is not always the best choice. In addition, you could have chosen a better music for this. Something that would let the joint feel energetic.
I understand that this could be your very first flashing, so doing this sort of mistakes is normal. Good job, non the less.
I can still re flash it no problem, if you want to c: