OOTP only has the MLB license. It does not have the MLBPA (player's association) license so cannot use real player faces or facegens. To have real players faces (photos or facegen) you have to use a mod.
Add on central, perhaps? I don't know for sure as my league was started in 2002 with v4 and is old enough it has turned into a fictional player league. I'm sure someone here will be able to point to a mod for you.
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