Geometric Forms

I have been taking Communication Sketching Class at Art Center at Night for a couple of weeks now. We do 10 sheets of homework a week basically working on the cube, sphere, cone and cylinder.
I have been trying my best although last night I found out I am using the wrong side of the marker paper. For some reason with the Bienfang you have to take it out and turn it to the other side. How bizarre.

I am hoping drawing all these geometric forms will help give more structure to my drawings.