I'd like to learn

[Vipershark]

You've got a lot of jaggies in these.
Look at your lines. See how they make... steps? You've got corner parts on your outlines and you need to remove those.


I did that on the top of the head.

See how the outlines are a lot cleaner now? They aren't perfect and still have issues but they aren't so ugly looking. Go through all three of your sprites and clean them up.