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.
For this assignment, take a photo of two separate materials intersecting. Ideas for materials include paper and plastic, bricks and mortar, and water and glass. Use creative lighting and selective focus to create an original photograph. Post your best image to the Web site.