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You can throw dice or use «dice throwing software» or hash the picture. I’ve decided to hash the photo because this is the quickest method.

To make it easier, copy this array three times and replace Fs with your values.

Note that the key is in hexadecimal format.

  byte key[] = { 
                  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
                  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
                  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
                };

I’ve used this photo as an input: https://images.pexels.com/photos/8538496/pexels-ph..

Hashed it here: https://md5file.com/calculator

And obtained this output:

1c1152b89a61eb609e55059de57e38e98a2bf76ad98c5c5658f451c53364c76f8c4d0792faf54339cdc54453150aea21402e58d8109985992740292405e01d99