Photography, apart from hardware, why is my gap so big? Great god, give me some advice?

His photo is better than your angle. His lighting should be positive, that is, smooth. There is a lamp behind you. If you backlight, your face will naturally turn black. . The composition of the photo, his model ratio is much better than yours. The background behind you is a mess of people. His large aperture lens can blur the background, but your card machine can't. The ability of SLR to measure white balance and the judgment of exposure are better than your card machine. These are automatic. . But with your card machine, you can make the white balance more accurate through operation. Take more photos with different exposures and process them in the computer to get the best photos. In fact, your white balance may be close to reality if the lights in the scene are a little yellow. In fact, if you look at the back of his photo, it is white. In fact, the background is too exposed, but the characters are better looking. Your camera can also overexpose him. But if the camera is overexposed by adding a gear, it will be adjusted in the computer. I would like to add that no professional will use the flash that comes with the camera, and the effect is not good. There is no need for a SLR to bring its own flash, so it should be used only as a last resort.