Color and shade:
To me this photo is more than just color contrast, but I think color is the most obvious. It starts off red at the bottom of the photo and turns into a deep blue at the top left hand corner of the photo. Mean while in the middle is a big black silhouette of the tree. The only color in this photo comes from the sunset.
I feel that it is also shadow. The sunset casts a beautiful silhouette of the large tree and the ground, making it stand apart from its background and grab your eye. I love this photo.
Photo by (nathan petty)