How does PS see that the film is good in color scale? How to see the photographer's skill

Mainly look at the histogram of a photo. If the exposure of a photo is accurate and moderate, the histogram should be evenly distributed in the high, medium and low light areas, and will not be seriously biased towards a certain area. For example, as shown in the figure below.

This can only measure the exposure of the photo. A good film, in addition to accurate exposure, clear and accurate subject focus and pure color, whether the composition is reasonable and whether the subject is prominent is also an important measure.