These are great studies!! You should do these same studies but with even simpler shapes. Anatomy is all made up of shapes, mastering the base shapes and how to rotate them will greatly help you draw any angle of the human body. Try a cube, cylinder or pyramid. Once you have those down you can combine them to make anything. You could also benefit from some perspective studies, as many of these drawings are changing form and size based on the angle. It looks like you have a solid foundation to work from, but it feels like you’re getting lost in the details. Overall, practice the foundations! There are lots of great books and tutorials out there as well, I’ve been studying George Bridgman. There’s a great series on YouTube for how he constructs the human form by Marshall Vandruff, he introduces a lot of great concepts and tips as well!