I was interested in the unity of color in the photograph; how the cool green and blue colors seemed to bring the photo together as a whole. In addition, the pattern of shadows on the chain link fence gave the subjects more tonal value overall.
Both shape and repetition were important concepts I was trying to trying to emphasize in this photo; the even repetition of the flower leaves, the small circular shapes of the flower buds, and the larger, jagged shapes of the flagstones in the background.
I really liked how the thick and thin lines of the telephone pole and traffic pole split the photograph into uneven quadrants in the background. Furthermore, I found the smaller, thinner lines of the plant stems interesting in silhouette.
The texture of the bark, and the texture of the individual needles on the pine tree caught my eye; I liked the way the sun filtered through the branches and highlighted some needles, while leaving others in shadow. Also, the natural symmetry of the tree--with branches almost evenly spaced on either side--was a beautiful image I wanted to capture.
I feel like architectural photographs like this emphasis so many principles of art and design. Among them; shape, line, negative space, the rule of thirds, tonal value, color contrast, and a sense of balance between the two halves of the photograph.