The Collection Images are located in the “Collection” Category within your POSTS section…
Replace each image as well as the featured image to alter.
Be sure to update the “addtobag”, “bagname”, and “price” custom fields to be appropriate for the bag.
The “collection_category_id” of this page determines what collection to use. To find the Category ID, Go to Posts>Categories and edit the category in question. The ID will be the number in the URL bar.
For Example, in red: http://willleathergoods.com/wp-admin/edit-tags.php?action=edit&taxonomy=category&tag_ID=217&post_type=post