This is a little exercise I did today of a bottle top in three different positions.
Mechanical pencil in the Zeta sketchbook.
One thing I really like using the Zeta for pencil sketches is the fact it seems the graphite doesn't smear as easily as it can on other paper surfaces. I worked bottom to top and with any other paper, the side of my hand and finger would have picked the graphite up and smeared it all over the page surface.
The bottle is a dark green color and what caught my attention was the bottle topper.