Stand in the center of the intersection and frame the shot so that the two trees on either side form a heart shape. A wide-angle lens is recommended for this shot.  
If you want to include a person, have them stand in the middle of the intersection, positioned along the bottom two-thirds lines of the frame.  
Dressing tip: Wearing fresh and energetic casual clothes will make the photos look better.

Fangjia Hutong - The Giving Tree