You did a really nice job taking your time with your lines, and that patience shows. That’s a strong habit to build early on.
Since you’re still getting familiar with structure and form, it would really help to start the head using simple volumes, such as a sphere for the cranium and a simple block or wedge for the jaw, before moving on to features. This gives you something solid to build on.
When adding facial features, try to think about wrapping them around the form of the head rather than placing them flat on the page. Drawing through the volumes and using light cross-contour lines can help you understand how the eyes, nose, and mouth sit on the curved surface.
It’s also useful to stay aware of how the planes of the head are twisting and turning in space, especially around the brow, cheekbones, and jaw, as this helps the head feel more three-dimensional.
As you build, double-check proportions early, such as the size of the cranium, the length of the face, and the placement of features, before committing to cleaner lines.
You’re off to a good start. Keep constructing simply, drawing through your forms, and letting the drawing develop step by step.