Titan's Pixelbook

[Tellis]

Actually, unless you're aiming for a specific game's style for the SNES or Genesis (or Turbografx?), or you're hacking a game with your own art, you really don't need to concern yourself with the true definition of 16-bit. With that, Previous is right, it needs more contrast. You could probably get away with reducing your palette down a bit. 4 shades of one color on a sprite that small is kind of ridiculous, you probably only need 3 shades of yellow, possibly only 2 (if I'm wrong on that, though, someone else correct me).

If I may ask though, what is it? A flower? A sun? What's the object's purpose?