His Behance and Instagram profiles have the words "Free Creative Commons visuals," but the place where I specifically saw a CC BY license was at the bottom of individual everydays posts underneath his profile, with an icon that specified the license when you hover over it. (See attached image.)
That said, some of his everydays posts have a copyright icon, not a CC BY icon. I'm not sure if that's an oversight based on how the default setting, or if he sets different rights for different everydays. I'll ask him.
