Which preposition to use with fingernails

with Occurrences 3%

She looked at her husband and gave him a silent, urgent message to break the awkward pause, a message which he disregarded, continuing coolly to inspect his fingernails with an abstracted air, contradicted by the half-smile on his lips.

down Occurrences 1%

I only hope he won't hold a g-g-grudge against me when he sees the mark of all my f-f-fingernails down his face.

on Occurrences 1%

The candles, Brutus." VI He rubbed his fingernails on his sleeve and glanced about him with a pleasure he seemed quite unable to conceal.

Which preposition to use with  fingernails