When someone tells you that you look like a Hozier song, they're basically saying that they think you're 'beautiful'.
Person A: "wow, you look like a Hozier song"
Person B: "thanks bro"
A song so beautiful that you'll need to take at least a week off just to think about it. When someone tells you that you look like a Hozier song, they're basically calling you 'eternally beautiful'
Person1: "you look like a Hozier song"
Person2: "aw, thank you"