the whale suffers from readability issues throughout the animation, theres only a couple frames at the end where I could tell what it was supposed to be, a main reason for this is the white underbelly blended in a lot with the sky and sea, maybe in the future strive to create some contrast via a change in the colorscheme or with use of outlines? It would improve the quality some. The fast movements of the whale could also use some smearing to make the entire thing feel smoother.