C/S 3/4 view is so hard!

One of my first OCs! Im able to get the face shot and profile how i want it, but im struggling converting it into a 3/4 view. How can i get better? Are there any specific fixes i could make? Face on and profile drawings are correct proportionately. What theory goes into play when drawing 3/4 besides prospective? Any general advice is welcome as well. Destroy my art so i can get better!