Why are my pictures taking up so much space on my iPhone

I have an iPhone 4S w/ 16 GB of storage. I only have MAYBE 200 pictures at the MAX and, yes, a few videos only a few minutes long, but for some reason it says I have 8.2 GB of memory used on pictures. I just went through all of my pictures, and I was thinking there had to be some app or SOMETHING using a lot of picture memory somehow. P

Please, can anyone give me a little help and tell me what could be causing this?

200 pictures hm maybe it's the music.

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