With two subjects, you can combine rules. Note horizontal yellow line through the eyes, and the yellow lines (intersection) near the cat’s face.

 

So, the secret to great pictures isn't only having a great digital camera with all the available features, it’s also knowing how to compose your image and recognize (or create) dramatic light.

To be sure, there are other rules of composition, but the "Rule of Thirds" is the most important and can make the biggest difference in your pictures.

Some other rules you may wish to experiment with:

Out of place shot – an out-of-place shot often involves a repeating pattern with a disrupting subject placed according to the Rule of Thirds. (Figure A-10)

Texture – a picture composed of pure texture requires no conventional subject. (Figure A-11)

Figure A-10: A subject which breaks the monotony.

Figure A-11: Pure texture can be a subject.

Figure A-12: Classical Portrait. Put the eyes near the upper-third. (Awesome light helps.)