The eye believes what it thinks it sees. This allows us to enjoy magic shows, movies, and two-dimensional art such as painting and photography. Any two-dimensional representation of three dimensions is of course an illusion.
Problems begin when the brain gets into the act. The brain thinks it is the smart one, and doesn’t like playing the sap. If the first impression of reality isn’t utterly convincing then everything is subject to analysis—to the detriment of the viewing experience. In the writing trade, when this happens it is said that disbelief is no longer suspended.
In other words, we look at art to start with “willing suspension of disbelief.” As long as the artist doesn’t wantonly offend apparent reality this suspension of disbelief allows one to get away with murder.
Like trust, once belief is gone it is hard to earn it back. The best tactic is not to lose it in the first place.
The good news is that the brain isn’t as smart as it thinks it is. Whether belief is suspended or not, every time the brain will go for the simplest explanation—even when cursory observation will reveal that an image is the result of complexity and artifice.