Often your image 'Title' will appear on hover, often on top of a transparent overlay that rolls over the image. Therefore, consider the length of the image Title and keep it succinct and descriptive.
You may view your hover effect options in the Themes area of your website.
To add new effects outside of the set MOBLE CMS styles, you will need to be on the Pro package, or have your website designed by a registered MOBLE CMS design partner. Please note that new styles are added to MOBLE CMS frequently, therefore you will always have the latest effects at your fingertips.