Auctiva stores pictures in at least three sizes. If you right-mouse click and check properties, you'll see the _th _tp and _o appended to the stored names, to denote each type. The picture was cropped and prior to upload was 990 H x 1489 W. So, the resizes are done by Auctiva.
Ms. Sophie Blue.....A Cat and Nine Tailes
Thumbnail _th max (80 H x 80 W) - There is also reference to 96 x 96 in the Custom Template creator, so there may be both a small _th and large _?? Thumbnail stored.
ebay picture default _tp max (300 H x 400 W)
Original _o max (768 H x 1024 W)