Just a novice opinion, you may want to experiment on different angles. Maybe one shot from the top of the head or from below, sideways, back, sitting pose or doing some actions like walking, jumping, or anything to make it look more dynamic. You can also think of including something of interest in the background (not just bokeh) though you must make sure that it doesn't overpower the main subject. You can also shoot at a different time of the day, probably noon or night or early morning. This will give different lighting/mood to your subject. Try also having some backlight (maybe a flash or the sun). Just be extra careful in your exposure. You can also experiment on flares. Flares caused by the sun sometimes has a distinct effect on your subject.