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.