Collection of sprites

[Sketchasaurus]

You seem to be over-animating certain things which muddles up clarity of the motion. There's a misconception that an animation needs to have a lot of frames to be well animated, but in the case of game animation, more frames means more programming work and memory usage.

I notice that a lot of things pop and jitter in those bowser animations, and a lot of things are going on that mess with readability inside the sprites themselves. you could easily cut frames and still have a great result, but the bottom line is that good animation is about readability, not the number of frames it has.