First object with shading

A small wooden vase-shaped object. The shading did not scan well. Perhaps I need to move the shading a key or two darker. I only wanted to use three tones: dark, mid-tone and white.

Drawing of a vase
The basic drawing, which I copied for parctising
Shaded vase
With continuous tone shading
With lines drawn by different pencils: HB for the light lines, 2B for the darker ones. I’ll try using 2B for the lighter ones next time.
Darker vase
Went over the previous drawing with 2B and 6B penciles. Stronger now.