Rainbow photography skills

There are two possibilities for background color deviation.

The first white balance is incorrect. It is recommended to use white card or gray card to customize the adjustment operation steps. Check online.

When the second lens enters the light, if there is backlight or side backlight, it will cause the lens to enter the light, which is easy to produce glare, and sometimes it is a color halo, which will make that part of the photo blurred. Just adjust the position of the light source properly