Further to feedback that we've had so far about the image upload process, we have implemented some changes to the way that works. It has had some knock-on benefits, too - specifically that photos will appear in the galleries of nearby locations, too, which should make it easier for the casual browser.
You will also see that at the bottom of every image detail view, under the Google Map, a short list of the nearest places to that location appears, to make it easier to go and look at the photo in its geographical context.
This means that the image upload process has changed slightly - in a nutshell, you add them from the Gallery section of your profile - the key thing is to make sure you add the location to the image once you've uploaded it.
You can read an updated guide to image upload here - enjoy!
updated by @iamtimbo: 13 Apr 2015 15:04:25