My best guess for stream terminology is that the subset brook includes small streams over rough terrain as seen in your pictures here, while creek is a large stream of sufficient breadth and depth that you can navigate it. Just don't be up the proverbial creek without a paddle!
I prefer the color images, but I can't deny the appeal in the black-and-white versions with the emphasis on aggressive rock texture contrasted against flowing water.
I think you nailed it. Thanks for stopping by @jacobtothe