>>7742500
>Rendering in Pen and Ink by Guptill 1997
https://e-hentai.org/g/2871460/1b9ce339be/
Linking some dirty piracy in case OP is broke (remember to give back to the community by paying fellow artists). I only skimmed the text but the pictures seemed informative enough.
I suck at inking personally, I first switched to microns and similar ink pens, then tried ink again and it's still blotchy and scratchy... Maybe I can somehow blame my old pen instead of my skill... I draw mostly digitally anyway though, not doing inktober.