Few requirements:

Items must be made from high quality materials. We will not accept products that involved child labor.

Your design has to be exclusive and limited to no more than 25 pieces or not on the market for another 6 months.

To maintain consistency, here are few tips to follow:

Come up with great product description that speaks well for the product.

Specify what sizes you have available or if you are willing to offer it made-to-order.

Minimum of 3 and up to 6 portrait shots -- consistent with 4x6 photos.

Minimum of 1 and up to 6 photos sizes of [952x480 or 1987x1000] in a landscape shot.