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.
Find an object around your house that has the potential to become a special image with the right light. Photograph a house plant that has great shape and different colors of green. With sun coming through the window and striking the leaves or stalk, it could make a wonderful photograph. You might have an old bicycle in your garage that, if propped up against a tree or a brick wall, would be a great subject and exude all kinds of personality in a photo. You could direct the light to reflect off the chrome of the bike or show shadows coming off the bike. It’s up to you.