Why is digital lineart so difficult.
I switched from tradition to digital a year ago and I realized I have made literally no progress. I find the hardest brush to use to be the hard round. Its lines are uninteresting when it draw them. I have no idea how artists create so natural looking lines so easily. I know they sometimes draw over their lines for varying thickness and vary their lineweights. But I can't even replicate some of their linework after tedious copying. Some samples of what I like in lineart are below.
Maybe it's a technical matter? Try various sensitivity pressure settings of your stylus. This can give more natural looking lines - thinner and brighter by little pressure. When the pressure sensitivity is set too high, even a light touch gives even, dark, thick lines - not varying much.