A general rule of thumb, don't dither unless you really need to :p
Try not to use gradients for pixel art either. A sprite this small doesn't need many colors.
Simple is better in some cases, after all.
Edit:
Whoops, deleted the image
![[Image: ULy23Kf.png]](/image.php?src=http%3A%2F%2Fi.imgur.com%2FULy23Kf.png&hash=49092a75f76f47b6a3ee1a48daa27257)
Try not to use gradients for pixel art either. A sprite this small doesn't need many colors.
Simple is better in some cases, after all.
Edit:
Whoops, deleted the image