It really depends on the face! My ex-husband looked much better with than without because he head is kind of an inverted triangle shape. I’m not being snotty, even though he’s an ex. He’s still very thin – I think – and has a broad forehead with very very dark, intense eyebrows and lashes on light blue eyes. His face is rather long, but his chin is very small. He didn’t get the braces he needed as a kid, and his teeth protrude a bit. Adding a full mustache and beard balances his face, making it more of an oval shape than a triangle. He shaved just the mustache once, and looked like an Amish farmer. I told him to get rid of the beard until the mustache grew back because he just looked silly.
One of my sons is a big guy, not fat, but broad shoulders and tall. He looks great in a neat trimmed mustache and beard. He’s a chef and it suits his face, personality and wardrobe.
My other son is small, with blondish hair that is absurdly long. I think it would take several months before you’d even see a mustache on him.
I like looking at the guys in ZZ Top, but I wouldn’t care to be married to any of them. Something might be nesting in there!