St. Mark's, on Moray Road just off the Hornsey Road, is full of faces.
Ruskin praised such details in medieval churches as 'signs of the life and liberty of every workman who struck the stone; a freedom of thought, and rank in scale of being, such as no laws, no charters, no charities can secure'.
St. Mark's is a very Ruskin-y church.
Ruskin also believed that wrought iron was a sign of madness, so make of that what you will.
Either way, it works here. The church is rustic and welcoming, and the faces balance that out by looking stern and aloof.