How to export all images and videos from Photo Booth to finder?
The easiest is probably to simply find the photos in Finder.

Open Finder
Locate the PhotoBooth library file (usually in user/pictures)
right click on it, hit show package contents
Copy all files from the Pictures folder (if you want to have the original photos without effects on them also copy the Originals folder)

You can read in a bit more detail here: OSXdaily