How do I restore deleted photos on my iPad?

If your Photos are synchronised with iCloud, you may still be able to recover deleted images for up to 30-days:

Delete and recover photos and videos on iCloud.com - Apple Support

You can access iCloud from any web-browser on any computer:

https://icloud.com

In Photos app, look for the Recently Deleted folder/album.

If any deleted images are in this album/folder, tap/select the images, you wish to recover, then tap the recover button.

If the images were already deleted from the Recently Deleted folder/album, then there is NO recovery of the images.

They are permanently gone/lost.