Try another fairly complex photo and see how you do. The human eye and brain work against you with detail. The brain prefers to record easy stuff like objects. Counting the objects gives you an extra piece of information to allow better storage in your mind. Linear detail is noise and gets rejected, unless you consciously note it worth remembering.
Textures are even more noise.
That's why most people can't describe the wall paper in their house. It's not an object or a line. You have to tune your mind to objects, then lines, and then textures to get the most from a complex scene. Try it just driving to work and see how much more you notice along the way.