@nina_kali_nina ok done with dinner, I have more thoughts on your post, maybe you will find some of them useful.
Some technical advice for pushing your drawing further:
I recommend experimenting with charcoal and conte chalk when you sketch. You'll be able to do more subtle gradients and more striking dynamic range, and a pink pearl eraser or a kneaded rubber eraser will lift it back up just fine if you don't like a mark, just like pencil.