First let me correct the sentences. 1. That picture was taken a long time ago.
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pathfinder1992 I believe that No 2 is not necessary, as the past perfect tense is not needed here.That would depend on the context. This is fine: The police did not really know what the suspect looked like. The picture had been taken a long time ago.
This is the question asked by the original poster. Looks like it is the question that determines which tense to use.
what is the function of "taken"?