大眼无神小眼勾魂
[dà yăn wú shén xiăo yăn gōu hún]
The literal meaning is 'large eyes lacking vitality and small mischievous-looking eyes'. It may describe someone's unique physical trait, implying that big but vacant-looking eyes sometimes don't attract people as well as smaller expressive or bewitching eyes, thus expressing the individuality, playfulness and intriguing nature of the person.