*Please note that you can hover over the photos in this tutorial to see example lines drawn in.*
These are the lines that lead your eyes directly to your subject.
Horizontal lines suggest peace, calmness, and tranquility.
Vertical lines suggest height, strength, dominance, and growth.
Diagonal lines in photography can suggest energy, motion, and depth.
Converging lines give photos a sense of depth, distance, and scale.
Curved lines suggest beauty, sensuality, and balance.
There you have it...how lines work in photography composition. Remember, though lines can create great interest for your photos, combining too many lines, or putting lines in the wrong direction can detract greatly from your photo's subject.