One week later
Piotr is painting.
This means his attention is pretty thoroughly occupied by weighty considerations like whether this shading needs more red in it. (Yes. Maybe. Or if he... Yes, more red.)
It also means there's paint all over his hands. He's managed to keep it clear of his t-shirt, but that might not last. This is why Piotr paints in t-shirts he doesn't care about.
This means his attention is pretty thoroughly occupied by weighty considerations like whether this shading needs more red in it. (Yes. Maybe. Or if he... Yes, more red.)
It also means there's paint all over his hands. He's managed to keep it clear of his t-shirt, but that might not last. This is why Piotr paints in t-shirts he doesn't care about.