Replace the filename at the end of the image URL with o.jpg
and you'll get up to 1000×1000 pixels. Other sizes are:
s.jpg
: up to 40×40ss.jpg
: 40×40 squarem.jpg
: up to 100×100ms.jpg
: 100×100 squarel.jpg
: up to 600×400ls.jpg
: 250×250 squareo.jpg
: up to 1000×1000348s.jpg
: 348×348 square