It's not bad, but I don't really like how he's partly floating. When he bobs up and down or walks, his feet slide unnaturally on the floor.

What he said, try to tighten the jump arc to have more weight to it. Some shockwaves or a crouch stun when he lands could sell that too.

Actually I would keep emphasis on the top eyelid movement, the bottom does come up to meet it slightly but the majority of the blinking movement is by the upper eyelid.

Here, in addition to being funny this showcases the concept well.

Second, the anatomy needs tweaking. The thighs seem to trail off into nothing, and the legs don't have much form to them! Sucky as it can be to learn,ALL good stylization is founded upon a strong understanding of anatomy. See samurai jack and disney's motorcity for examples of teo ends on the style spectrum, you can best see the concept in action through their art styles because they start with strong anatomical understanding and push and tweak from their to keep their look clean and pretty!

Notes: sometimes you gotta flub perspective in favor of composition, lower the horizon or raise/deform it enough to break the effect it's got now where everything is lost for all the details clashing with each other.
Second, it looks like marble rather than sand both for the lack of gritty texture and the way it's just totally flat under the chest. Bulge it up around the bottom, put mounds in! Sand bunches up into ridges!

Tip: try to describe the work you need done!