非常简单。
1 表示照片是属于他的 ------- His pictures of his girl-friend standing by the Thames -----照片属于他，里面的内容是他的女朋友。
2 表示照片上的人就是他------Tom's picture of himself and his girl-friend standing by the Thames ------照片属于Tom，内容是他和他的女朋友。
又如：
1 my picture of Shanghai
2 my picture of my brothers and me
His pictures 表示属于他的，但照片上不一定是他本人。
some of his photos
表示照片是属于他的；
some photos of him
表示照片上的人就是他。
some photos of his/his some photos
some photos of him
his photos
a lot of photos of him
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