oof - That is really really small!
At this size, I think you'll need to simplify your shape to make your sprite more readable. Right now its a bit hard to tell what it is (I'm thinking an armless robot with something on his back, right?). And also: you could do with less colors. The top left one already has 20, the majority of which are different shades of grey. Here, so many shades won't be noticible, so you can just lower that palett are re-use the colors a lot more.
Hope this helps!