>>1354307I usually eyeball it. They don't have to be 100% perfect (unless doing lines for mecha/objects, but that's my opinion) and, if done right, gives the image extra "depth", because humans do not press down in a uniform way when making images.
Not saying that uniformity is bad - I use thick strokes some times to get a certain "effect" instead of using strokes, because that uniformity, in that case, adds the extra depth I am looking for.