Photos use too much space on my iphone?

I have iphone 5s 16gb and it can only hold 200 photos, which use about 4gb. My friend has 16gb iphone 6, 2000 photos and they only use 6gb. Is there problem with my phone?

Added (1). Can i change resolution of my photos?

Lower the resolution

No, there's no such problem with your iPhone. The problem is that the photos on your iphone are of a better resolution than that of your friend's.

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