Hi, and welcome to these forums.
I messed around with it and came up with this:
Anyways, I AAed some of it (not the black outline, mind you. It can be done, but that's a stylistic choice in my opinion
)
What's more important is that I increased contrast... alot. Teh contrast = very important because it defines shape, gives form to whatever you happen to render. I also those extra shades to define how teh bunny object is shaped.
Read a coupla' tuts. I suggest going to the general forum and checking out the tuts/linkage thread that should be stickied...
I suggest the ones on spriteart.com. They're written by qualified pixel-pushers.
Good luck in your quest for the
Holy Grail pixelation skillz.