I am not a techie, but my understanding, due to a similar issue, is this: When you delete a picture on your phone it allows the phone to overwrite the memory used to store the picture with something else. So there may be hope.
I took my Note 5 to a tech shop (Blackapple Cellular, don't know if that's a chain or not), and they were able to restore my phone to the condition it was in before I fethed it up, for a cost of around $50.
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