[Hebrews 11:6]

Perhaps so, although I hadn’t noticed until your inference.

[spankalib]

3 of the paintings show beads/rosary and bird/beast-like feet:
#14 John of Flanders (click image source to see)
#17 & #31 both Botticelli

2 have only the weird feet: #15 & #35.

Given what I could (briefly) find @ the artists' backgrounds, I find it difficult to believe they are out-and-out slamming the Catholic church as a whole.
Maybe they're implying 'some priests are bad'? I just don't know.