Gosh,

Purpose is the key of life. No purpose, no Life.

Any intention coupled with sincerity and trust works.
I bet you have 'intention' every time you open up someones 'books'. Especially IF you suspect they are 'cooked'. <smiles>

Do you trust your-self to just want to know ?

Practice remembering something not associated with PhotoReading. Like recount at days end all the conversations you had and write them down.

Similiar process, different venue. But the skill will solidify.