What I really mean is, when I am not going out of my way to compose a picture in an artistic way, say I am just taking pictures of an event, or inanimate objects - what types of things should I do to make the viewer care about my photo?
Think about why you wanted to take the photo in the first place. Ask yourself why
you were drawn to it and do whatever is necessary to make other people see it the same way you did. The best way to do this is to find a way to exaggerate the parts of the photo I think are important i.e., colours can be intensified, isolation can be exaggerated with a little though about composition, as can over-crowding - think tight shots with no room for movement.
I have an example
here of a photo depicting isolation and romanticism. This was a spur-of-the-moment shot - they were strangers and didn't know I was taking shots of them.
They were in the water for ages with one other person playing with a ball. I had an idea of what I wanted in my head with the tall fountain behind them and basically prayed that I would get two of them on their own (three was a crowd in this case!) and just kept shooting in case anything with all three of them turned out well. I was just lucky that they split up a bit and these two took this "pose"! Whether they are an actual couple or not, I have no idea - they didn't kiss or do anything couple-like the whole time I was watching them.
Basically, the whole thing is exaggerated. They happened to be away from the other guy who was fetching the ball, the guy in shot happened to be kneeling down and was gesturing whilst talking.
I've taken it and blown it all out of proportion by making it appear as if they are on their own in the fountain and that he is giving some romantic speech or potentially even proposing. Nothing of the sort was actually happening and about ten minutes after this was taken, the Police arrived and told them they weren't supposed to be playing in the fountain!
I'm not saying you should go around faking scenarios and making up stories for every photo, I'm just saying that with a little thought and possibly a bit of imagination, there's potential interest and a "story" in all the photos you take.
We see in 3D and experience an emotional reaction to things we see. It's difficult to get the same reaction from a flat image on a 2D screen or piece of card, so we need to exaggerate to produce the same reaction.
Edit: Just as a matter of interest here's an original unedited, unused shot of
all three of them.