Drawing Accurate Shapes

You weren’t kidding when you said this is a hard one! It was so challenging to resist shading things in. It’s almost as if you need the shading to nail things down,  otherwise the shadows play tricks on you and move around. I spent hours on this and erased and started over so many times that the paper became fuzzy and scarred, but it was great practice and I felt like I learned a lot from it. It made me really slow down and EXAMINE the shapes. Thanks, looking forward to the critique!