3D Geometry and Shading

Topic: [Drawing 1/Meeting 1]3D Geometry and Shading

Tools:
-Sketchbook Paper A3
-varied level of Pencils (HB, 2B-8B)
-Eraser
-Ruler (15 cm and 60 cm)
-Tissue (to cover my hand and smoother the shading)

Lecture:
so, for the first meeting, of course we have an introduction. after that, the professor give us an assignment to draw 3D geometry and shading it
the first line is the projection. we have to make a cube as the first step. then we make some line to create the shape we wanted without ruler (freehand)
the second line and third line is to make the same exact 3D geometry like the first one freehand. after that, we should shading it so it looks realistic
lighting doesn't matter in this assignment, as long we can shading it and can see the volume (idk how to explain, sorry)

I'm fail with the cylinder one...I can't keep the consistency...and I already fixed it, but I forgot to capture it LoL sorry guys

the professor told us how to shading it. sadly, I can't see it because so many students come to the front (and I'm short)...so I have to use my knowledge of shading skill.
when I give my work, the professor said that it's good, but I'm doing wrong with the second line prism. my shading are wrong so it doesn't looks like a prism. but she said okay, so she took my paper and I don't need any revision