Prof Key

PC application to retrieve photos from your iPhone's iCloud

I think you can use data recovery tool, which is designed to recover data. The following steps will teach you How to Retrieve Photos from iCloud.
recovery-tool.com/ios-recovery/recover-photos-from-icloud.html
Step 1. Download the iPhone Data Recovery on your computer and install it first.
Step 2. Choose iCloud Backup File and sign in your iCloud Account.
Step 3. Enter the program and choose any of them you want to get back and click the "Download" button. After downloaded the files, click the same button to start extracting.
Step 4. Click "Camera Roll" on the left side of the window, and then preview the record. Choose what you want to recover. You will get back deleted photos after clicking "Recover".

You'll be excited to find retrieve photos in such a easy way!