Like any other girl. You click at the camera symbol at any location on the map. Then you have to configure the film (genre, settings). After the settings you should choose a girl. You can see three tabs. The left one includes the casting candidates (max 3 candidates at the same time). When you have picked one, you continue with position and toys to finish configuration. And now you can START FILMING;-)
Same procdure for photos at the photo studio, but here you have to pick poses instead of settings, position and toys. The options for the poses are connected to the quality of your camera.