The transition layer contains an image, which will change to another image on hover.
The image without the mouse cursor being over the transition image.
The image with the mouse cursor being over the transition image.
These are the available image changing animations.
First image alt, Second image alt Expert
Alt text for the images. Put here some word related to the images to have better SEO.
You can add an url, or pick from the given link options, where you can find lightbox or slide switching options. Also you can choose if you want to open up your link in a new page or in the current one. And there are rel attribute options too.
If turned on the Layer image optimization will optimize the image.