Across the campo from the church of San Toma is the gothic Scuola dei Calegheri (Guild of the Cobblers or Shoe-makers). There’s another beautiful Madonna della Misericordia relief on the façade of the scuola and below that, a lunette over the door that shows San Marco healing the cobbler Anianus, who'd hurt his hand while making shoes and converted to Christianity after Mark healed him (and later became a saint himself). This Renaissance relief was sculpted by Pietro Lombardo, who may have copied a drawing by master painter Giovanni Bellini.
This is the scuola, with the Frari campanile behind it:
The Madonna della Misericordia on the facade:
The Lombardi/Bellini relief:
The Madonna above is just one of many images of the Madonna della Misericordia (Our Lady of Mercy) in Venice. Venice was the first place that I ever saw this particular Madonna, but now I'm seeing her all over.
And just recently, I saw a lovely one at the NC Museum of Art in Raleigh. This one is German, not Italian, carved of lindenwood in about 1470, and called “Madonna and Child Sheltering Supplicants under Her Cloak.”
From the museum website:
"The image reminded Catholic worshippers of the Virgin Mary's role as an intercessor before God, always ready to plead for mercy on behalf of those in physical or spiritual distress.
The Madonna stands on a crescent moon, indicating her role as Queen of Heaven."