 Conversely, he also added still life elements to other artists' works.This is believed to be the case in the (c. 1661, Auctioned at Sotheby's on 7 July 2005, London, lot 10) where Boel is believed to have added the still life on the left and the parrot in the portrait painted by Antwerp painter Pieter Thijs.Boel was accomplished in large-scale vanitas paintings depicting an abundance of fruit, flowers, game and precious objects.