HI! I did a very quick draw over with my phone, I hope it gets the idea across🙏😅 you seem to already have a lot of knowledge in drawing portraits, I especially love the way you rendered the hair -Generally if you want to make anything look more 3D you have to consider which direction is the light coming from (in the draw over it's coming from the right side), and most importantly try to block out the big shapes of the shadows first on the subject -knowing the form and structure of the head is also important to get the values right, I highly recommend doing value studies, needs more darker values | Artwod Feedback