Photography is demanding in several ways. Location finding is time consuming, as no documentation does exist. The hikes are long, often full days with all equipment on your back and finally, as no spectacular landmarks exist, it is all about picture idea and composition. Maybe that's the reason why not many pictures do exist.
There are no roads, which cross the NP, but at least a dense forest track network dating back to the times when it was heavily forested. This network is now used by MTB riders. To give you an idea about the length of the hikes. If you want to reach the heart of the NP it will be 3 hours one way without any alpine huts with accomodation. A MTB or eMTB would really help sometimes!