Try clicking on the spectacles on the POTN example. If the pic is now are the same size as on FOP, POTN is reducing size to fit the window, and spectacles show it at full size.
A 'Website Review' place rated POTN (with AMASS) as being very good with regards to displaying in a user friendly way across many platforms and devices.
That requires some scaling to be written into AMASS.
On FM recently, people were experimenting with the way photos are displayed. It was discovered that if the removed the 's' from https, it had a positive effect.
I'M NOT SUGGESTING YOU DO THAT, just mentioning.
On FM, it's also well known that images appear a little soft. "Click the Flickr link to see in full quality' or similar is a common comment and they are not taling about a larger sized photo, rather the same size photo with no softening. It's subtle, but noticeable.