Ключевые слова: background, backpack, casual, casual clothing, caucasian, cheerful, childhood, children, classmates, classroom, corridor, day, development, different, diversity, education, elementary school, enjoyment, ethnic, friends, friendship, fun, girls, group, happiness, happy, horizontal, kids, knowledge, learn, lifestyles, looking, mixed race, outdoors, person, portrait, pupils, school, schoolboy, schoolgirl, serbia, smile, standing, student, studying, teenage, togetherness, young, youth,