Ideally, you should size the thumbanil to the size you want it displayed in the product detail page. Problem is, if the thumbnail size on the product list is much smaller, it looks distored when scaled too much.
One way around this is to simply code in a third image to the product description and remove the thumbnail image from the product template all together.
Hope this helps!
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Padraic Ryan
Ryan Design Studio
Professional E-Commerce Development
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