PEOPLE: Photographic works that mainly express the lifestyle and living conditions of the characters, including portrait works. CREATIVITY: Observation of the real world in creative perspectives, or a new work obtained by reprocessing of existing photographic materials. All materials must be taken by the participant him/herself. NATURE: Photographic works ranging from various phenomena in nature (such as meteorology, walruses, and earth phenomena, etc.), to the ecology of animals and plants, or even celestial bodies. DOCUMENTARY: Photographic works that mainly seek to record the reality of life, reflect the relationship between people and people, and the relationship between people and nature, record people's activities, and describe the systems and customs in human social life. ARCHITECTURE: Photography of buildings and structural objects. It can be a building, a group of buildings, a region, or a city; it can be a whole building or a part of a building; it can be outdoors or indoors. STILL LIFE: Inanimate, man-made objects that can be freely moved or combined as the object of expression, and mostly industrial or handmade products, naturally occurring inanimate objects, etc.