Hi there and welcome
can you tell me the make and model of the phone and if the pictures where stored on the internet memory or an external memory card please?
ok, go on your computer to www.icloud.com
Sign in with the same Apple ID you use on the phone and tell me please if you see the photos listed there.
Are you on a windows or Mac computer?
you can then download the photos to your windows computer and then add them back to the phone via itunes (if you wish to still have them on the phone)
To do this, install iCloud from my link below
Then follow this video to setup iCloud to download the photos to your computer
you will then have them again from the cloud.
Let me know the results please,
Yet you say you saw photos when you signed into www.icloud.com correct?
ok.. but are you able to respond to my last question please?
As if you signed in with the same Apple ID on www.icloud.com as you used when installing the program, you would see the photos.