In the old days people would defensively register .net and .org if they had the .com. They would also register the plural if they had the singular and vice versa. The importance of registering the .net and .org as defensive registrations has diminished Greatly. New Gtlds such as .photo and .photos are so similar you need to own both. I wouldn't worry to much about .photographs. As time goes by chances increase that your unique.newgtld will encounter another similar enough to cause confusion.