I like photographic challenges. To me the most difficult is telling a story properly with a standard set of 10-15 images.
How the images relate to the subject, what you are trying to stay, and even more elusive: how the images relate to each other in color or B&W? focal length/perspective, sharp vs OOF, and on and on and on: multiple factors.
Verses a single stand alone photo that any hack can capture once in their lifetime of 100,000 pics taken.
Try taking 2000 images of a project and having to EDIT that down to 12 images that succinctly and cohesively tell your story, move your audience, win prizes in photo competitions, and gets you published. You think this is easy? Therein lies the challenge.