where do i go to view photos from iphone on icloud

If you are using iCloud Photo Library, the photos on iCloud would be the same as the photos on your phone and would be viewed by using the Photos app on the phone. See: iCloud Photo Library - Apple Support

If you aren't using iCloud Photo Library but are using iCloud backup, there is no way to view the contents of the backup. It can only be used to restore the device or set up a new device. iCloud: Restore or set up your iOS device from iCloud