How to analyze the structure of a famous painting?

Composition performance of several paintings:

The painting depicts a beautiful girl in the most difficult warm red tone. She is sitting in the cradle of love dreams, quietly waiting for the arrival of her lover. The composition is set off with a rare semi-circular carved frame, symbolizing the taste of waiting, waiting for perfection!

Such romantic scenes often appear in painters' paintings. The arc-shaped foreground sets off the beautiful scenery, which is in harmony with the vertical column, just like the P-shaped structure composed of characters, echoing from afar but not the same. And the rich color matching adds to the fiery and passionate love. Let's observe the facial treatment of two characters. The man's face and body are in the dark, cleverly setting off the girl's face and body facing the light. In western oil painting, the theme and effect of the picture are often expressed through light and shade, light and shadow. The painter's superb basic skills can also be seen from the depiction of face, hands and men's knees.

When I saw this painting, the most eye-catching thing was this chair with a shell. The painter showed the girl's movements from her head to her neck, then to her hips, and then below her knees. S-shaped curve composition, semi-exposed breasts, the hand in the mirror is closer to the face, while the right hand is far away from the face, giving people a diverse and unified aesthetic feeling. Behind the luxurious chair inlaid with bolts, the rainbow-like light shines, setting off the beauty of the girl. Moreover, this posture gives the back of the chair enough display space, and perhaps the painter was deeply attracted by this chair at that time!