Adam Clarke on Song of Solomon 7:4

Thy neck - as a tower of ivory - High, white, and ornamented with jewellery, as the tower of David was with bucklers. See on Sol 4:4 (note).

The fish - pools in Heshbon - Clear, bright, and serene. These must have been very beautiful to have been introduced here in comparison. These two fountains appear to have been situated at the gate that led from Heshbon to Rabba, or Rabboth Ammon. There is a propriety in this metaphor, because fountains are considered to be the eyes of the earth.

Thy nose - as the tower of Lebanon - There was doubtless a propriety in this similitude also, which cannot now be discerned. If we are to understand the similitude as taken from the projecting form of the nose, even here I see nothing striking in the metaphor; for surely the tower of Lebanon did not project from the mountain as the human nose does from the face. It is better to acknowledge that there was undoubtedly some fit resemblances; but in what circumstance we know not. But some commentators are always extolling the correctness of the imagery in those very difficult places, where no soul sees the similitude but themselves.