Select Bern in Photo Travel in the main GT Life screen. Any positions will do, but 2 and B are the ones I used.
The girl you need is the one in jeans and white/grey jacket, talking on her mobile phone, sitting next to your car. Aim the camera with X, and holding down R1, push the right stick up to zoom in on her face. Use the left stick to move the reticule directly onto her face. Press (square) to auto-focus. Take the picture when she is looking directly down the lens. You may need to try slightly different angles to get the trophy to unlock.
You do not need to save the picture.