A medieval illumination of Percival
On the left you can see Perceval receiving the sword from the Fisher King. On the right it looks like the procession of all of the artifacts that Perceval reframed from asking about.
The Attainment: The Vision of the Holy Grail to Sir Galahad, Sir Bors, and Sir Perceval
Number 6 of the Holy Grail tapestries woven by Morris & Co. for Stanmore Hall
Artist: Sir Edward Burne-Jones, William Morris, and John Henry Dearle
I think Perceval is the one kneeling before what I think are three angels protecting the Grail.
From what I found, it seems Sir Galahad has been depicted in art far more than Perceval.