Yup, my advice is to practice things like draftsmanship, anatomy, gesture, etc. traditionally, but digital helps a lot with "cheating" when you need it.
For instance that last one I did, the line art is 99% the original line art, but I used "LT Conversion of layer" in clip studio to clean it up. Also things like layer mixing are useful, so there I used a multiply layer to easily get some shadows down. And if you're struggling with anatomy or something, I know a lot of people, even pros, will use 3D models to get it to be more precise.