Can I retrieve deleted photos from iCloud?

You can recover photos before 30 days , by signing in with apple id and password of iPhone using a web browser at www.icloud.com

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

Or another way is recover photos directly from an iPhone Delete and recover photos and videos on iCloud.com - Apple Support

You can only recover iCloud photos, that are still in Recently Deleted. Are they still there? iCloud is keeping them for 30 days.

When you are viewing your photos on a computer at www.icloud.com in Photos, check here:

Otherwise you have to use any backup you made of your photos.