M o o n b i n i
Hm, after nearly stalking your tumblr, can i ask a few questions?
#1 - You wouldn't happen to use Paint Tool Sai, would you?
#2 - What are your brush settings!? When I see people with straight line art it makes me crazy! Why was I not blessed with this ability? I make sure you can not zoom in on my art or else you'd see just how messy it really it.
haha i welcome all art stalking! and of course, i hope my answers help~
1) i actually use clip studio paint pro, but i've been thinking of getting sai! i do like clip studio a lot though, which is why i haven't switched over yet (also i'm cheap and i got clip studio on sale).
2) i use the normal brush settings with a stabilizer and ability to snap in place. and i line with the pencil tool, which is called "darker pencil" in CS. i line with varying brush sizes to get more definition. i also work in a big canvas, usually 2000x2000 if not bigger. when you resize down, that lets you hide any shaky lines haha. ummm otherwise, it just took a lot of practice to get straight lines...i will redraw lines a lot and i've also found using short strokes helps too.