Correct
画龙画虎难画骨，知人知面不知心
/ huà lóng huà hǔ nán huà gǔ, zhī rén zhī miàn bùzhī xīn /
Strokes
Example
Definition
in drawing a dragon or a tiger, you draw only its outward appearance but not its bones; in getting to know a person, you may know his face but not his heart