How to delete photos from iCloud
First: How to delete photos from iCloud by using iCloud.com
Log on to icloud.com.
Choose the Photos icon.
Click on Select Photos.
Choose the pictures you want to delete.
Log on to www.iCloud.com
Follow the illustrated explanation
You will see the login screen Enter your Apple account then the password and press Enter
Applications and options that appear, choose Photos
If your account contains some pictures and videos, you will find it in front of you, then press Select photo
Select the pictures you want to delete and then click Delete
After clicking delete, the confirmation message will be deleted, press Delete
Your photos have now been deleted from iCloud and in front of you, only 30 days before Apple finally deletes them.