I wanted to create a sketch style for a Pony model, and this is what came out.

The basic promt looks like this, you can experiment with it:

pos: (score_9,score_8_up,score_7_up), <lora:sketchstyle:0.65>, (imbasketchstyle, abstraction:1.05), sketch style, (paint style:0.4)

neg: (score_4,score_3,score_2,score_1), (earrings:1.1), worst quality, (bad hands, bad feet,:0.9) monochrome, 3D, CGI, render, photo, text, watermark, poorly drawn, low-resolution

Trained on tponynai3, recommended :)