What's going to happen to my photos on iPhone when I sync it with someone's iTunes?

My friend has a lot of music on her iTunes and I thought that I could sync my iPhone with her library. I know that once I do that all the music on my iPhone will be erased but what will happen to my photos? I tried to back them on my laptop by copying and pasting it but from 3067 photos only 2975 were copied and I selected all four folders.

Anyway, my question is. What will happen to my photos once I sync my iPhone with someone's iTunes Will they be erased?

If your friend also synced her photos - they probably would get mixed under different directories. Or something like that…

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