Compared to a detailed, high-resolution photography, brush-drawn art has a much lower resolution of the image, much less details are visible.
The human mind seems to replace the missing details with an internal model that is idealized, therefore giving the impression that a painting is "beautiful", "more" or more perfect than reality.
Very true. That was the entire driving force behind impressionism.
The red light ("red light district") makes imperfections on female skin (which are often bluish in color, for example small bluish veins) much less visible (no blue light --> blue things become "invisible"), creating the illusion of perfect skin, therefore driving this business.
Huh, never heard that before, but it makes sense.