All pictures backup

Hi faiza262,

please start here If you're missing photos or videos in the Photos app - Apple Support

If this is not working you would have to restore your data from a backup, if you have performed backups in the past.

Restore items backed up with Time Machine on MacOfficial Apple Support › guide › restore-files-mh11422

Apple can not restore any of your files, you would have to do that.

I strongly recommend that you start with backups, if you are not doing already.

Only a good backup strategy will prevent data loss.

Ralf

Please read the following user tip and restate your question/problem in detail: 

     Writing an Effective Apple Support Communities Question - Apple Community

You've not given us nearly enough info to begin to help you.