Check the lines. Avoid unbroken circles. Avoid dominating lines going completely through the frame and lines leading you out of the photograph. Lines can be used to emphasize your subject or draw you into the photo. Try using Lead-in Lines.
Diagonal lines can be dramatic whereas straight vertical or horizontal lines are more static.
Check the lighting. Harsh, direct sun can cast heavy, unbecoming shadows on people. Use the direction of light to your advantage by trying different angles and shooting at different times of the day. The light just after sunrise and just before sunset is usually warm and usually the best time to photograph. The low angle of the sun creates beautiful lighting on hillsides, tree trunks, etc.