As I've shared a number of Grinnell Lake pictures in the Glacier National Park photo gallery, you probably figured out that I really liked this subject. For this image, I utilized the rule of thirds - 1/3 grass, 1/3 lake and 1/3 dark shadow as moving up the frame on the left. The lake also starts about 1/3 of the frame into the image with the stream flowing into the lake showing in this area.