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Don't take it and re-edit it then claim it your own for the glory. I just rushed a few things out of your sprite to point out how to improve

New Left, Old Right

Starting with
1. Don't Gradient Shade (Google it)
2. Don't ever use Microsoft Paint Colors... Ever! Custom your colors! (Though i used your colors to fix it, don't do it)
3. Make the eyes seperate from each other
4. Use the tutorials we suggested. We said it a hundred times yet you refuse and constantly defend your work against us when you asked us to improve your work
5. Anatomy. No further explanation needed
6. Don't use Sel-out like i did in the Mario sprite on the left unless you really know how to use it well
7. Experiment with shading and colors. Don't restrict yourself
8. Take criticism with ease. Don't get angry if your sprite is not good enough.

My sprite improvement on the left is not the best but its a basic and artists could criticize on my edit aswell so it could teach you more and to take notes

Uhh, I DID use the tutorials you suggested.

just saying

Make the eyes seperate from each other

they are separate.

ｎｏｔ　ｒｅａｌｌｙ