How many photographs will my iPhone 4s hold?

How many photographs will my iPhone 4s hold? - 1

I think that will depend on how much storage came with it.

How much storage does it have on it? Is it 8 GB, 16 GB, 32 GB or 64 GB

Depends on the storage available of course.

It depends on the capacity of your iPhone and the file size of the pictures, obviously the more detailed they are, the more space they take up, meaning less storage.

No way we could possibly know that since we don't know how much memory you have, or how much you have remaining after all the other things you have on your phone. Then, all photos don't produce the same file size -- another reason we can't answer this question.