I found out that the emotional side of observation is quite important to me. It’s like this: if I’m interested in the world and the people in a child-like manner, positive, just accepting, not cluttering the information provided by the world with my “emotional” filter, bad feelings, being irritated or controled by a bad day, I observe quite more.
Here’s a workout I used to do and still do sometimes. It’s a nice thing. Start a stopwatch for 3 minutes. Observe everything around you. Listen to everything. Watch everything. Smell everything. Try to note everything that happened. If someone coughed, note it. Was it a single cough or several ones? Was it a cough of a sick person? How many cars have passed you? How many of them were the color yellow? What were their licence plates?
The ultimate goal would be to be able to have this sort of awareness whenever you want to. It might lead to clutter of unimportant details which would be bad for analysis. But it doesn’t have to be like that. It’s having a lot of details on hand. You should choose which ones are important for further analysis, not closing yourself to details you think aren’t worth noting. The point is, here, to create hyperawareness.