OCEAN OF LIFE (cover art and anatomy sketches)

Made this cover art for my personal 2d animated film - OCEAN OF LIFE (2018). As well did some Marine animal Study for the animation. They have a very direct gesture line, variety of shapes but not to complex (well, besides the Octopus...）Because their surface makes it easier to read the plane.
Here's the link to the film: https://vimeo.com/464245648