Keep it simple for impact.

This simple photo of a door is strong and powerful because of the strong blue and also because it is uncomplicated. But there is also a deeper story here. The letterbox looks like a hastily-cut hole right at the bottom of the door. I don't know why someone would do that. It means that the postman has to bend down. It's also obvious that the postman didn't even notice where it was. There is a touch of humor in the way that the large unprofessional sign-writing unambiguously points to the highlighted slot. It's a quick and dirty fix for a bad job. But I guess it works.

---

Wood:

In this photo, there is only one type of object. We have a semi-regular pattern, but most of all an image of texture that makes you want to touch it. You can look at it and almost feel what it would be like. Again, this is a very simple picture with high impact because of the simplicity of composition and high level of detail.

There are photographic opportunities everywhere. All you need to do is look closer, and observe with the artists' eyes.

---