Hello Deepu,
Please follow steps to export photos from salesforce developer org to your desktop:
- Go to Setup
- Select Data Export under Data Management.
- Click on Export Now or Schedule Export as per choice.
- Please check Include images, documents, and attachments and Include Salesforce Files and Salesforce CRM Content document versions.
- Check Include all data under Exported Data or selection as per choice.
- Click on Start export.
- Once export done .zip file is downloaded where you find Document, Attachment etc folder so fetch out the required images you want from there.
Hope this answer would be helpful !!