An Account Recovery Photo is a variation of the ID Confirmation Photo (IDCP).
The only difference is that the handwritten note must say:
"For unlocking my Kraken account - I confirm that I am corresponding with firstname.lastname@example.org ticket [your ticket number], [current date], [your signature]"
Be aware that in certain situations we may request that you write something else on the handwritten note. Follow the instructions provided to you in your ticket closely.