When shooting white shoes in the studio, the white balance is to manually adjust the white background. The background color of dark shoes is white, but light color is the only one.

That's the problem of your photometry, whether you average or spot-measure, because the reflectivity of white is relatively high. If you measure the white part, it will be close to 18% gray. At this time, it is equivalent to direct white measurement, and the metering is inaccurate. So it can be inferred that you are using a constant light device instead of a flash device. Brother, when measuring the white picture, you should add one or two exposures to make the white reaction normal, or use an exposure meter to measure the incident light intensity and come back. It is a truth to shoot with snow scenes. A large area of white will inevitably affect the photometric accuracy of your fuselage. Teach you a stupid way to put your hands where you put your shoes. Measure the back of the hand with a point on the fuselage, and try to show it according to this data.