Your edge detection examples are really basic stuff: there are way more advanced studies and examples. Search for example for "Coherent Line Drawing" by Henry

Your edge detection examples are really basic stuff: there are way more advanced studies and examples. Search for example for "Coherent Line Drawing" by Henry Kang (image from the research: https://d3i71xaburhd42.cloudfront.net/92b2ec5ef4f58c4206fc5cee9c5f0e9435870c69/2-Figure2-1.png https://d3i71xaburhd42.cloudfront.net/92b2ec5ef4f58c4206fc5c...) or for "XDoG: An eXtended difference-of-Gaussians ..." by Holger Winnemoller, Jan Eric Kyprianidis, ... (https://ars.els-cdn.com/content/image/1-s2.0-S009784931200043X-gr2.jpg https://ars.els-cdn.com/content/image/1-s2.0-S00978493120004...)