Must have been the fastest painter in the world; to have sketched and colored the painting in a matter of hours, and without the subjects having to stand still in uncomfortable positions until their limbs went numb! Just saying... would have been a tad bit more realistic if they had left it at a sketch.
Also, if I had been that painter, there's no way I would have argued against Cassius, lol. Like, yep, you're absolutely right, my lord. Not looking forward to joining him in the dungeon.