192168: I think that Marges right breast is too small. Like not proportional to the left breast. Also Barts left hand is missing.
Furthermore the lines are really pixelated. @DOUGY What software do you use? This looks like a software problem to me.
192168: @DOUGY: If you have the money consider a drawing tablet. Cheap ones go for about 80$. But only if you have the money. Tablets can get really expensive. And if you buy too cheap can work bad.
So if you don't have a tablet draw on paper, scan it (using commonly used printer/scanner with at least 600DPI or if nothing else is available your smartphone) and then either extract your lines into a vector image (if you have a good scanner) OR use it as a drawing help like in this tutorial: https://blog.cinnamonteal.in/illustration-mouse-krita/
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Furthermore the lines are really pixelated. @DOUGY What software do you use? This looks like a software problem to me.
So if you don't have a tablet draw on paper, scan it (using commonly used printer/scanner with at least 600DPI or if nothing else is available your smartphone) and then either extract your lines into a vector image (if you have a good scanner) OR use it as a drawing help like in this tutorial: https://blog.cinnamonteal.in/illustration-mouse-krita/