I am not good at simple styles. But the obivious answer would be some shoes and hands would be nice.

Consider shading the right leg with brighter colors, otherwise it looks like his legs are behind his torso, moreover, animating same-colored legs would be hard. Also, his left leg looks strange.

Regarding hands and feet, it could be a stylistic choice to omit them. After all, you omit mouth and nose. Also, it is hard to discern if that pixel is part of hair curl or an eye. The neck could be a little too fat, but that is a again a stylistic choice, depending on what kind of character you make and your art direction.