The background is a full-body 3d art work of a lovely junior high school girl st

The background is a full-body 3d art work of a lovely junior high school girl standing in front of the blackboard in the classroom, wearing fashionable casual clothes, holding a book in her hand, with a warm smile on her face, big eyes and long black hair, vivid color scheme, strong contrast between cold and warm colors, bright light, background focal length of 35mm f1.8,C4D, blender, etc. OC renderer, high detail 8k