^Actually, that's not bad at all for a mouse drawing. Also, you have to consider that on your adoptable site, that image is going to be smaller so SOME of the imperfections will seemingly disappear. Oh by the way, have you tried this:
Back when I didn't have a tablet, I used to draw all my stuff on paper, take a picture of it, open the picture in an editing software, and then trace the lines. The more you scroll in, the smoother your lines will be. Hope that helps. :3
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