While browsing the Recent Images, once you select a picture, you get inside the gallery where she belongs. So, choosing "Previous Image" and "Next Image" won't take you to the previous or next "Recent Image" but the previous or next from the Gallery that the picture selected belongs.
This makes the navigation of the "new" images very difficult since the members need always to go back on the browser to select the next picture.
Would be a great development it was possible to browse image by date, regardless the gallery where images belonged.
Edit: Maybe this should be on "Features Requests". Feel free to move the topic.