Don't be bashful! If you want comments, give comments. You don't need to be an expert photographer to express your opinion about the work of others. You don't need to go into great depth. A simple remark about cropping, composition, color, subject matter, etc. can be of just as much help to a budding photographer as an in-depth critique.
This assignment is to show you how to better see the ever-changing light over the course of time, especially through the twilight time and to teach you to see how your camera handles those changes. Shoot a sunset at a chosen location. Shoot a number of images of that landscape from 20–30 minutes before the sunset through 20–30 minutes after. See how drastically the light changes throughout that relatively short period of time.