To really develop Sherlock Holmes-like perception, you need to slow down. I need to slow down. Take your time. Go out and have a walk. Look at people. Go into a café. Look at people. Listen to people. Don’t always be in a hurry.
Besides that, I do have one other problem. I start daydreaming. The habit of looking at the outside world still isn’t there. While I don’t have anything against daydreaming, I would still like to be in charge of when I daydream and when I observe.