This is a lossy .jpg file with simplicity as the photo composition. Clearly the smiling pup is the subject of the image. It is also a good example of the rule of thirds.

This is a lossless .png file with a good example of leading lines. The natural lines on the zebra are leading lines as well as the less bold lines of the fence.

This is a lossless .gif file. As you can see the couple is framed really well in the gazebo type structure.