Which preposition to use with preen

before Occurrences 1%

The Beautiful Wicked Witch went on posing and preening before the mirrors, and seemed to have forgotten all about her new little prisoner.

over Occurrences 1%

March had brought them, and then had gone away and left them for the April showers to pelt and play with; and now, when the redwoods on the mountainsides were singing that May was almost here, a whole slope of poppies lingered rebelliously to nod and peer and preen over the delights of the valley just below.

Which preposition to use with  preen