No, I don't have any Gainsboroughs or Canalettos for sale, I just want to know how to create an Ebay listing with large pictures similar in size to those displayed on this item.

I am using a Panasonic Lumix DMC FX35, if that is of any relevance (I suspect not) and I have no problem uploading pictures to listings, it's just that I want them to come up full screen size, as in that listing I linked to.

All advice gratefully received, as ever ...