Is the shape of my face in the mirror different from that in reality? My face looks more straight in the mirror, but it looks round and ugly in photos. Is it because the mirror beautifies people?

As long as the mirror surface is flat, the face shape in the mirror will not be different from the face shape in reality.

According to the imaging principle of one-way mirror, objects form equal virtual images in the one-way mirror, so there is no saying that mirrors will beautify people. The main reason why the mirror image is different from the image in the photo is because of the different viewing angles. Looking at your own mirror image in front of a single-way mirror has a relatively single perspective, while photography usually uses different angles, which leads to the difference between looking in the mirror and taking photos. The results obtained vary.