apple restoring photos problem

recently i've bought iphone 6 plus and have been taken photos using the new phone for a few days. then, when i use icloud and restore from backup (from my previous iphone 4) the photos in my iphone 6 plus now is what it is from my previous iphone 4, so what i want to ask is where can i find back my pictures that i've been captured before the new iphone 6 plus restore from backup!! ur help will me much appreciated thx^^