User blog comment:D.Ryan/Bridgette Tenenbaum In Bioshock 2/@comment-75.90.98.165-20100620230544

Her 'young' photo was possibly one of when she had just arrived in Rapture, for there is a photo of her with a longer face , meaning she had aged a little (that being one of we could only assume of how she looked in Bioshock 1). In Bioshock 2 she had aged yes, that being her understandable stress. Her skin could of too gone more sensitive to the sun from being in Rapture, that too being another possible cause of her skin imperfections/liver spots.

As for her photo of her being aged, there's really no telling how they updated photos. Eleanor too has a more recent audio diary photo which was of her older, instead of the little girl she was.