What if I don’t tell you who the photographer is?

You can tell him that you took the photo yourself, or you can tell him who the photographer is tactfully and indirectly. Then go around and show that it's you, and take out some of your works to tell him your strength, or you can tell him about another person. Nowadays, many devices, such as mobile phones, are very advanced, and many of the works produced are very good, so there is no need to worry.