Hi, Dahlium. Our names are pretty similar
If you're having trouble grasping the form, I suggest starting off with simpler shapes and 3D forms first, rather than trying to understand the rather complicated structure of the human face/body.
You've probably heard this suggestion before, but studying the Loomis books will help you improve a lot. I suggest going with "Fun With a Pencil" first, even though it's a bit basic, it'll give you a better grasp on simple shapes so you can move on to more complicated ones. Drawing The Head and Hands is great for improving your portraits, like the one you posted here.
Practice often and you'll definitely improve in no time
"artists see the worst in everything they love. it's how they keep themselves grounded."