[mjfisher]

I'm on mobile; I scrolled to the bottom and clicked the image of the painting and could zoom in to my heart's content - did it ask you for an account?

[Freak_NL]

You can zoom in a lot on the 2490 × 1328 pixels offered. When you hit the download button for the full version, you get nagged.

Edit: you can zoom in, and then it will offer up the painting in slices at a higher resolution. So in theory you could download those and stitch them together if you manage to hit an unscaled version.