Until I saw these multiple exposure and overlayed photos taken by Holga , I was not interested in taking landscape photos.
This is how one frame looks on the Holga:
These photos are taken with Holga 120 CFN but the flash on this camera was not used. The colors are the result of cross processing velvia 100 film and pushing it 1 stop during film processing.
Cross processing is when slide film is processed in color negative film chemicals and vice versa resulting in color shifts. The amount of color shifts depend on the film and how much it was underexposed or overexposed. Most people use color filters while taking photographs to manipulate the color shifts as well. It is not recommended to extremely underexpose or overexpose the film, anywhere from 1/2 stop to at the most 2 stop is common.
Pushing and pulling film are lab processes where you alter the film's processing time to compensate for overexposed or underexposed films. In this case the photographers tell us he/she pushed the film 1 stop during film processing. The lab has their own measure for what push +1 stop means. Each lab is slightly different so it is best to use the same lab each time for consistent results.
In most cases underexposed film is pushed with means longer film processing time to compensate for the underexposure.
In most cases overexposed film is pulled with means less film processing time to compensate for the overexposure.
When the film is underexpose by 1 stop it is not necessarily pushed by 1 stop. This depends heavily on the type of film and the lab you use. You would need to do a few test rolls to find what you like and what works for you. Remember you push or pull the entire roll and the labs charge extra per roll for the push or pull.
Photo taken by golovkin-fedor