Damn. You're probably right. I didn't know, and none of the surfer pics I found were clear about which side of the board goes up. (Oddly, it's only now crossing my mind that I should've just skipped the images and topped "which side goes up" in the search box.)

Thanks for the input. It's appreciated.

The fin helps with steering and stability kind of like the rudder on a boat. But I've come back to look at this image multiple times because I do like it that much! Something draws me back to it.