How to adjust the lighting of people's clothes in the studio and how to set up the camera? Please ask professionals to answer.

Manually set the white balance, first take a picture of the background with mf, and then set it as a custom white balance. Manual setting is more accurate. Also, did you shoot it with a tripod? If there is, there should be no shaking. You can adjust the exposure compensation. The principle follows the principle of "white plus black minus". As the main light, a lamp is placed at a height of 45 with the camera. The other lamp, as an auxiliary lamp, is placed a little further away, which is also 45, and the light is better than 1:3 or 1:4. As the upstairs said, you have to try this again and again, mainly to expose the subject evenly. There is also the problem of shutter aperture. I don't know what lens you have. It's hard to speculate. Aperture should not be too big or too small. Generally, it is similar to 5.6, so we need to try more. Iso is set at 100-200, which has low requirements for sensitivity, and the high sensitivity of 450d is not good. There is a tripod set at 100.