Icloud Photos gone

Hello,

I am sorry for writing this and asking for help, I know there is an answer but i don't have time to search for it.

so here

I wanted to log out from App store but i logged out of Icloud , and after few hours, I wanted to check some of my photos and they're all gone except of few of them...

please help me solve this, thanks !

P.S. i was on icloud.com but there are no photos except mine from Iphone photos...