Is complimenting someone like this seen as flirting?

So let’s say you say to a guy something like “I love your mustache. It accentuates your nice smile.” Is that considered flirting or just a nice compliment?

It’s just a friendly compliment
That’s definitely something you say when you’re trying to flirt
Depends (please explain)
Select gender and age to cast your vote:
Is complimenting someone like this seen as flirting?
Post Opinion