That tail wag looks differ then crystals tail wag owo
It's 7 frames instead of 6, with more curving and more of a "snap" at the top. (good for bouncing stuff on the tail) I use this one now and the other . . . wait . . . I don't have tail frames . .. huh. I use this one and a breeding I did a while back, although I edit them slightly each time ^^
EDIT: I edit them, because I know I'm not perfect and each time I do it looks a bit better ^^ Tail wags are kind of hard to make huge improvements, especially with only 6-18 frames, but editing a simple (simple for me) tail wag improves my skills in something like full body animations.