Even though one can upload high-resolution photos to Yelp, the images Yelp shows on business pages seem limited to a resolution of 600x400. Sometimes that makes it impossible to see what someone means (example).
Is there some URL hack to access larger versions of a Yelp photo? Many sites store the original along with the sized-down version they present to the user, and the original is sometimes accessible by changing the photo's URL (e.g. Instagram, Flickr).
I've tweeted at them, but I doubt they'll do anything about it quickly.