Irregular iPhone photo storage?

My friend have an iPhone and so i do.

My phone 1162 photos - 4.8GB
Friend's phone 1699 photos -1.8GB

(All photos are taken with iPhone only)

I'm sorry have no idea but just wanted to thank you for your advise it means a lot to me

It's really strange LOL… Maybe your friend takes photo by the infront camera and you take photo be the back camera… Another possibility is your friend use iMyfone Space Saver for iOS to compress his photos. So his photos take less space than your even his photos are more than yours. IMyfone Space Saver can compress your photo to save up to 75% space for you.

That depends upon the picture quality. You friend must be using low quality pictures don't worry about it, instead get Leo Privacy Guard and make your iPhone utmost secure.