See if you made it in MSpaint I could understand why parts of it look kinda garbage, but since you used Paint.net to create this pillowshaded, jagged mess, I feel personally insulted for no particular reason. Few months ago I posted a tutorial on how to do pixel art/sprites in the help and support section. I HIGHLY suggest you check that out. Especially the parts about how to create a proper outline, and how to shade properly.
Please do not use any of my assets (graphics, scripts) in works affiliated with the Novaverse. This applies to the original releases of those assets as well as any third-party variations (recolours, script alterations). Thank you.
The ABC of Creation