Try to do the following: create an image that evokes a mood. And your images are more valuable if they convey mood and have meaning more than the strictly documentative and factual.
Images, more than any other artistic expression except perhaps the written word, can do that. The other day, I was in a venue that had art on the wall, and I came across a water colour that more than anything evokes “depressing”… a scene, incidentally, that we in Toronto will see soon enough:
So your challenge is to do the same in a photograph.
An example snap to get you started: in mine, too, weather plays a role, but traffic, my nemesis, does as well:
See what you can come up with: a good exercise in any case.