Your friend is correct. It should be favorites .
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AnonymousHe said because I left off the word "photos" at the end of the sentence it would revert to plural "favorites."Exactly right.
AnonymousI'm curious why dropping the word photos would cause the word favorite to change from singular to plural?Because 'favorite' becomes a noun (a pronoun) instead of an adjective and acquires number.
AnonymousIs there another example you can think of that would cause a similar change?No, and that's a problem. Hmm...
AnonymousIs there another example you can think of that would cause a similar change?It's not a very productive transformation in English, but there are a few examples.