Brain Room line drawing_Gray Scale

Brain Room Gray Scale
My first full value study with traditional medium.
I was frustrated knowing that I can not undo (control Z), but it was very good exercise to remind what I have learned previously.
Fundamental is the key!

Weapon Design_Final Value

I am posting my Final Gray scale tone drawing.
I did this after Environment Gray scale study, so I had easier time doing this and had fun with it.