know camera roll photos vs other received photos ??

michael5050 wrote:

I want to make it clear

I can't distinguish between taken by my phone and photos received from apps as WhatsApp or downloads

Well you don't as whatsapp photos are now integrate with your camera roll.

michael5050 wrote:

how to differentiate between photos taken by my iphone and photos received in the photos app

Open photo app - scroll down to utilities - open imports.