Alright, please excuse the bump... I'm a bit uncertain here. I tried going with another style for the dirt, but I really can't tell what looks best. So I suppose I'm asking for opinions here. BTW, the color count is at 16, including the white (transparency if I wasn't so lazy to make a gif).
i dont know if i am allowed ti suggest some colorchanges on your tiles and your sprite (i am only a beginner so if my suggestiones are a piece of shit dont be angry with me please).
here is my suggestion:
less contrast in grass, a little less saturation and another color.
I changed the color of the jacket of the char and did some changes with the legs + set some highlights.