This photo was taken using the Rule of Thirds. Notice how it is in the far left third. The reason why this is a good photo is because of the background, lighting, and subject. The background of the photo is blurred out and popping with vibrant colors. On top of that the subject is an interesting one for it is characterized with a soft delicate body. This pops out to the viewer giving them a sense of beauty.
This one was also taken using the Rule of Thirds. Everything in the photo is okay except for the lighting. Unlike the picture above the light is a bit darker and dull. Also the subject isn't as interesting as the previous one.