You can actually see the difference in my lineart from the beginning of my comic to the end of it because for a long time I was only doing flat colors so I put all of my effort to learning to do as much with line and blacks as I could. If you want to go back further A long while ago I had a webcomic called 3 Wishes on smackjeeves which was mostly before I had a cintiq and before I could really do some nicer line work. But it was also before I really had the ability to so it really wouldn't matter much. For a long time during that I did this time consuming pen tool fill method in photoshop. It was clean and sort of feigned some amount of line variance but it was mostly vector style line art. It evolved over my time on 3 Wishes but jesus it took forever to do and I really don't care for the way it looks anymore anyway.
3 Wishes in case you're curious about some of my old work and the way that line art looked.
And here is my current work
