Face bareheaded. The watermark of employees' photos is required to be standard, with the front bareheaded, the head accounting for about 2/3 of the photo size, the white background without borders, the pixel of 626*4 13, the resolution greater than 300dpi, and the format of JPG. Watermark refers to the traditional method of engraving and painting with wood in China. Pigment is mixed with water and contains no oil, which is different from the general color printing method, so it is called "watermark". Also called watermark woodcut.