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 a great beginning exercise meant to loosen up your shooting techniques. Choose an object at least as large as a car. You should be able to walk around the entire object. Now shoot a minimum of 30 images of this object (but upload a maximum of your 3 best for critiquing purposes). Get down low, hold your camera up high, move in close, back up, change lenses, and play with investigating this object in as many different ways possible, including shooting it at different times of the day. The purpose of this assignment is to get you moving in directions you would not normally seek out. Work on making each image different and unique. Push yourself to really look for different views. Don’t forget to change the orientation of the camera from vertical to horizontal and in between. Shoot in a way you’ve never shot before. Have fun and surprise yourself!