Well the results look great!-- I didn't think you were using pens like those (I though it probably was some type of crow quill that you were using). In my experience using that type of pens, I usually get these stiff, lifeless lines-- though of course it's the hand and not the tool. Do you hand-write the texts when working all-digital as well...? Pheew...! I've had a tablet for the last 3 years, but I only use it for coloring lineworks that I scanned-- adjusting the pressure of the pen is already beyond my knowledge there.
What I sometimes like though, it's working all digital when making roughs-- I haven't been able to get results that I like very much, but it's very fun doing so.