How to change your custom tab image
Custom tabs can be found on the right hand side of your Facebook page, below the cover photo, as shown below. Four tabs are visible, one being photos which you cannot edit.
Make sure your most important apps are showing in this top row. You can swap positions with other tabs as well as adding eye-catching images to these tabs so your visitors click on them. Because the images are so small, less is best is the general rule to ensure these tabs are easily readable. In the video at the bottom of this post, I give a quick demonstration on how to add images to the tabs.

Some sizes for you to refer to:

A quick video:
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Bev Hayden recently posted..How to use Facebook for business!