People used large bowls to mix wine with water or spices at feasts. Drinking wine is a metaphor for enjoying beauty. The litotes can be translated as a positive. Alternate translation: "may it always contain mixed wine" or "may I always enjoy its beauty" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-litotes]])
The Israelites thought mounds of wheat and lilies were pleasant to look at. Much wheat was a sign that there would be much food to eat. They threshed wheat in high, dry places, and lilies grow in low, wet places, so this simile combines beautiful sights that people would not usually see at the same time. (See: [[rc://en/ta/man/translate/figs-simile]])
People thought that the color of wheat was the most beautiful color of skin and that round piles of wheat were beautiful. Alternate translation: "Your belly has a beautiful color and is round like a pile of wheat" (See: [[rc://en/ta/man/translate/figs-simile]])