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In "The Husbands of River Song", we saw that River had pictures of all the Doctor's incarnations ("War Doctor" included) from his first regeneration cycle. In River's timeline, her visit to the Singing Towers of Darillium at the end of that story took place shortly before she went to the Library in "Silence in the Library"/"Forest of the Dead". She simply recognised the Tenth Doctor from his picture. In "The Husbands ...", we also saw that she had no pictures of incarnations from after the Time Lords granted the Doctor a new cycle of regenerations in "The Time of the Doctor", which is why she initially didn't recognise the Twelfth Doctor.