How to shoot a beautiful girlfriend with iphone?

Mobile phone imaging is automatic, and it is impossible to obtain an ideal depth of field by changing the aperture and shutter. If you want to take a good photo of your girlfriend with your mobile phone, I suggest you learn more about portrait composition, including the choice of angle, foreground and background. In the early stage, you can look at other people's photos online and imitate them. That would be too late. You can install VSCO, snapseed, Meitu Xiu Xiu and other software on your mobile phone, and do some post-cutting, color matching and blurring.