Hello mohsin001,
Welcome to Apple Support Communities!
We understand that photos in the recently deleted folder are blank and you're unable to delete the photos from then recently deleted folder. We're happy to help!
Try the these steps to permanently delete the photos from the recently deleted folder.
If you want to permanently delete your photos or videos, you can remove them from the Recently Deleted album. When you delete a photo from this album, you can't get it back. Here's how to delete photos permanently:
- Open Photos and tap the Albums tab.
- Tap the Recently Deleted album, then tap Select.
- Tap the photos or videos that you want to delete or tap Delete All.
- Tap Delete again to confirm."
For more information about deleting photos see this article:
Delete photos on your iPhone, iPad, and iPod touch
Let us know if you have any questions.
Thank you for using Apple Support Communities.
Take care!