/ic/ - Artwork/Critique

Really need your help /ic/. This is my current level, I started going to an Atelier and this is what I made drawing from life, It's stil not very good, it has a lot of errors compared to the original and the shading isn't very well done, yet I'm not a total beginner either.

My aim is to become a digital artist, landscapes and characters, considering my current level what would you suggest me to do? What books and courses?
Also quite important, when should I make the switch to digital? I'm quite dogshit at drawing on it so I will need a lot of practice. Thanks