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There are two custom fields used for all post's thumbnail images
Custom Fields Keys
1. "preview-big" is for the Featured Category thumbnails
2. "entry-preview" for all other category thumbnails


HOW TO USE CUSTOM FIELDS FOR IMAGES
In order to get thumbnail images to appear on the homepage, a custom field image needs to be added to each post. Towards the bottom of the post editor page in your WordPress dashboard is an Advanced Option called Custom Fields. What you need to do is open that section up, and create a new key (listed above) as well as include the image source for each image you want to show.