My first time, drawing an human face.

I did the other tutorial, the demo, it helped me a lot but I have some doubts. 1) How can I improve when drawing the lines, whether for shadows or for the light part of the pear, compared to yours, mine seem to have no shape, as if it were only filled with the gray tone, but I don't know, note the lines that fill the shape, just pure strokes of gray 2) Why do the parts where the shadows are generated turn out to be an intense black, it seems like I was just drawing without following the shapes, more than a shadow, it seems like an intense black. That would be all, I hope you answer me, thanks for everything.

My first try in level 1, its my first day in the course.