On my device, low res versions of the images are displayed, I had to click them to open the full res versions — which I very highly recommend!

e.g. I zoomed in to view the matchbox texture described in the article, and found it a blur. (Clicking loads the uncompressed PNG.)

Personally, I think for this page, loading full res images inline is warranted. The resulting 3MB page size would be more than justified :)

This is stated under the first image: All images on this page are clickable and link to non-lossy versions when available. The aim is to not have large amounts of data be downloaded by default.