When He wants to say how beautiful She is, He is not content with a single statement. He praises Her thoroughly. He goes through Her eyes, hair, teeth, lips, mouth, temple, neck, and finally her breasts (Songs 4). Or, He goes the other way around. He goes through Her feet, legs, navel, waist, breasts, neck, eyes, nose, head, and finally her hair. (Songs 7) Top-down and bottom-up; He loves Her through and through.
(Similar pattern when She praises Him: head, hair, eyes, cheeks, lips, arms, body, and legs (Songs 5).)