The first rule of good plastic surgery is a lot like the first rule of Fight Club: you never talk about it. It’s easier to keep it to yourself when no one can tell you’ve had anything done, which many say is the true measure of good plastic surgery. Having said that, an experienced eye can tell.

So, we asked the pros, how can you really spot the signs of exemplary work with the scalpel? Here, they break down the best indications of really good “face work.”