Is creating a vector image from a photograph breaking any copyright law?

Is creating a vector image from a photograph breaking any copyright law? I've created a new vector image from a low quality photo, which I downloaded from a Pinterest page. I would like to use the vector image in a logo. It contains stylised lines and is not a perfect match, but it's my interpretation of it.

Am I breaking any copyright laws?

This is the Vector (Top), and photo (below)

I've tried to find out who owns the original photo, but this has been difficult to obtain.