Sorry took me a while to get back to ya, hope this anon still has hope and checks back but anyway here we go:
PHOTOSHOP
If you like these ^^^ lines you can use the brush from here (a tpl made by Jun Ling), one of the first 10 brushes in the list. Play around with the brushes and you’ll start seeing the others I’ve experimented with in other pieces :O
CSP/MANGASTUDIO
If you like these ^^^ lines they’re literally the default Textured Pen in Clip Studio/Mangastudio. Other notable CSP mentions are the default Bit Husky brush and Frenden’s 2B Real Pencil brush (used for this pic in conjunction with the Textured Pen)