[zarh]

You can restore the deleted pics from the trash after she leave and keep them in a crypted folder in your computer.

Best is if she don't ask you to delete them.

As readed above, tell her you love to look at her pics and jack off to them when she had her period or days you don't make love or when she's not at home.
That's best to look hers than other girls and so you keep very attracted by her even more and more and want her more every day.
Women love to be attractive and even if they not recognize it easily it's a turn on for her too that their men go hard wood when thinking about their nude bodies.
She must feel you're attracted by her.
For the start keep her confident and after each photo session review pics with her and allow her to keep or delete any pic she want. Each time she delete a pic, leave a little comment about how beautiful she was on this one, which part of her body you like in the pic, her smile, her "little b*tch" eye looking 😉
Spice up your word a little. Put her on your knees while you doing this and kiss her and caress her.
She need to know, view, and be absolutely convince that you have her in the flesh and don't kidding when you say her nude pics turn you on a lot.
Soonly she will delete less and less pic and there is less pics to restore and move from trash to hidden crypted folder.
She need to be sure the only pics you keep are the ones she allowed. This way she will accept more shooting session. Made the shooting a fun moment, go nude too with your wood on 😉 and don't forget to kiss her, lick her and even fuck her shortly between each pose. Show her it turn you on.

Of course, for the pic she'll not delete, promise to keep every pic private and protected.
Set up a second official crypted disk for your nude pics, this way she can been sure no one fall on these by going on the computer.
And don't forget to backup everything as computers sometime crashes.
Keep us informed.
I hope you will do it both.
It's great pleasure to have a woman who pleasantly displayed her nude for you to shoot

And when she'll pose nude and let you keep all pics, you can get the deleted one back in light and tell her you manage to save these treasure as well.

Sometime, the "souvenir" arguments works well too. You'll be happy in your old days to look at your youth fun nude moments.