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.
Nature always ranks among the most popular photo subjects. Much of this appeal comes from our sense of wonder at the beauty of plants and flowers. Whether you enjoy shooting close-ups of a bud unfolding, or an entire mountainside of spring flowers in bloom, there are a number of ways to approach this type of photography. Again, good lighting and composition are key to getting great images. Possibly the best light is the soft, diffuse illumination of open shade or a cloudy day. Like gardening, photographing flora and fauna can provide a peaceful and enjoyable communion with nature.