A few tips for successful photos...
1. Turn off the Photo Notification bubbles in the PS4 settings. This will keep you from getting the annoying camera icon notification in your shots. This was just added with the latest FW.
2. Switch the file format to uncompressed PNG instead of lossy JPG in the PS4 System Settings. The files will be larger, but more beautiful.
3. Take screen shots using the built-in Photo Mode. Turn this on in the Uncharted 4 settings.
4. Get familiar with the different filters, zooms, tilts, and especially the Depth of Field (DOF) slider. This will help you draw focus to certain objects. Start by upping the intensity of the effect initially (R1), setting the exact distance you want and then gradually rolling back the intensity (L1) until you hit the perfect level. You can also hide characters if you just want the landscape.