A book can have a photo in it's pages, and a photo on the front cover. On = at the surface, In = under the surface.
22 กันยายน 2014
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Generally, you would say that the photo is IN the book. "On" can be correct in some special cases, as mentioned above.
22 กันยายน 2014
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Thank you very much!
23 กันยายน 2014
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If your photo is found inside the book, then it is in the book
If however you placed your photo on top of the book, then it is ok to say that it is on the book