Hi there! Niteowl here to leave a quick review.
First off, I hope you got credit for turning in that assignment! I know I've been guilty of doing assignments as the teacher was coming to collect them, though I know there's no way I'd be able to do this in 20 minutes.
Secondly, this is overall well done. The shading is good and the shapes are mostly well-defined, especially the pyramid on top of the prism. The one I think is iffy is the shape behind the pyramid on top of the prism. I'm not sure if it's meant to be rectangular or rounded-the shadow looks more rounded than the others but the shape itself is more rectangular. If you need to revise this, I would try to define it more clearly. I'm also a little confused by the cube in the top right that appears to be floating. Perhaps that was part of the assignment (to make it look like it's floating in 3-D space) but on the face of it it seems odd.
This is a bit nitpicky, but it seems like the shadow behind the prism on the right is going a different direction than the others, like it's more east-to-west than southeast-to-northwest (not sure if that makes sense but it's the best way I can describe it).
Overall, this is well done and better than I could do, especially in just 20 minutes. Keep drawing! 
Points: 35774
Reviews: 1274
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