Me - currently using GIMP
I don't know much about art but I've heard that GIMP and paint.net are both good and free. In some cases, you might need to set transparency too which I'm doubtful MS Paint allows.
You drew your avatar in Paint?
And @Vincent Chu, GIMP is completely free. I use it instead of Photoshop for that reason.
i drew most of my game in ms paint
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