Егорнов Сергей 1860 1920 Цесаревич Алексей Николаевич Холст масло часть 1 - Russian and soviet artists Русские и советские художники

The picture has something of this: people, child, portrait, wear, son, lid, chair, room, boy, man, furniture, museum, castle, girl, sit.
Perhaps it’s a painting of a young boy in uniform standing in front of a table with a vase of flowers on it and a chair.