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.
As you know, no photographic images can exist without light. Shadows, on the other hand, are typically ignored. For this assignment, I want you to include shadows in your image as part of your composition. I want you to explore their potential. For best results, shoot this assignment on a clear, bright, sunny day. Once you gather several images you are happy with, post your favorite to the Web site.