Epson Perfection V500 - Manual (Page 215)

The Auto Photo Orientation feature will not work when you scan
newspaper or magazine pages, documents, illustrations, or line
art. The feature will also not work when you scan images that
are 2 inches (5.1 cm) or smaller on any side.
The Auto Photo Orientation feature may not work correctly for
all image types. For example, it works best on outdoor images
that include a bright sky at the top. For images of people, it
works best when they are facing forward and are not too far
away.
If you’re scanning using Thumbnail previews (Home or Professional Mode
only), select the image and click the rotation icon to rotate it. See
Previewing and Adjusting the Scan Area for instructions.
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