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.
Arrange to create a portrait of someone in an environment that relates to his style of living or work for this assignment. First, talk to your subject and come up with a spot that makes sense — that will tell your viewer something about your subject without using words. Next, figure out the time of day you need to shoot; the light should be just right, illuminating both your subject and the environment. Post your best portrait to the Web site.