The sprite sheet is arranged haphazardly. A 4 frame walk cycle looks jerky. The character looks like a bobblehead with bread loaves for appendages. The character sheet returns 75 colors. However, each image of the character has a count around 38, so some color cleanup is needed. I use at most 32 colors for an entire project.
There are a ton of free character animations on itch. You'll have to be outstanding to make money from assets. I'm in a similar position. My game with original assets is free, and nobody wants it.