I wanted to create a Lora with a little bit thicker line. So I took nice lineart drawings from the likes of Moebius and Manara and vectorised them with a free app called Inkscape. Seems to be working out okay.
Usage tip 1: Upscale your image to get an even crisper look. The preview images use the 4xUltrasharp model (in Automatic1111)
Usage tip2: Despite my best effort, sometimes some greyscales creep in. Negative promting can help with that
Usage tip 3: Different checkpoints gives different results. If you're not happy with the results, try switching to another checkpoint.