What program do you use?

Paint Tool Sai.

well what helps me because I have really shakey hands, is when I'm doing the base sketch I put the smoothness on 3, then for details on the sketch like clothing and such I put smoothness on S-3 then for lines themselves, on S-6

It evens out bumps and shakeyness

hey hun... all i used was photoshop on cleaning up the look of a pencil sketch by darkening and making some of the details that were erased become less visible. your welcome to download the images and try your hand at cleaning them up if you want to i don't mind

The one on your gallery?

both of the drawings on my gallery the friend that did the images wasn't heavy on the pencil so i had to make them darker without being too much