Ive had the same issue where I feel im never "ready" to do my own projects that I want to do because I know I still have so much to learn and areas that I need to improve on. Lemme say after 3 years of doing nothing but exercises and mini studies, I still dont feel "ready" and ive seen pros talk about the same thing that youll never feel ready, you just have to jump in and do it anyway and dont be afraid of failure. The best way to learn is from your mistakes. One of the biggest things im noticing for me is that all the studies and exercises im doing are good and all but Ive never really put them into practice in a final piece. So even tho I understand the concepts of them, actually making it all work together in one piece is another skill that needs to be practiced. Making time to draw what you want and have fun is just as important as doing studies and exercises because speaking from personal experience, you can get burnt out pretty quick only doing rigid boring exercises. You can also try to find a way to implement those exercises into something you want to draw. Ive seen art work that wasnt like super crazy detailed or rendered but it got the idea across and thats what made it interesting.

Only had enough time to do one of the hands for level two so heres the 1st hand at an angle thats like as if it was being pressed on a window and we are looking at it from a bottom view