First of all, I swear that this has been a complete and utter case of randomness and that I didn't notice that the person whom I critiqued ten minutes ago is the same person whom I am critiquing now (to be sincere, the first was random, I had to click your profile to find this).
Second: Take this with a mountain of salt. I don't draw digitally. It's evident that there is a huge gap between your digital and traditional skills. What I can recommend (since you are more than able to draw gestures and figures) is to draw circles, ovals and squares on your tablet, over and over again. Yes, it sounds absurd, but it works for habituating to everything. From painting, shading, switching grips etc. You have to learn the basic movements and shapes...again.
Here are some resources: https://www.ctrlpaint.com/videos/sketching-lines https://www.ctrlpaint.com/videos/fluid-linework
Third: keep at it! I can't wait to see your digital finished drawings.
Best wishes and keep practicing.