First of all, I don't know why you're cramming them all in a 64x64 space, it doesn't help you work. Unless you made them separately somewhere else.
Your light source is not clear. You are definitely pillowshading and zooming in I see waaaay too many colors. Grass doesn't look like grass for some reason, though grass isn't easy to draw well. Your bushes look like felled trees that are far too small. As said, lose the stems and don't ignore some advice and fight with other bits. Black outlines aren't helping.. you probably ought to antialais them.
I don't know what's going on with that dude's hat! Guy on the middle left. A baker or something? Make the bend on the hat happen sooner and show less of it.