The person being painted is the subject.
Portrait painter
A triptych.
The point in a painting where the eye is drawn to is known as the Focal Point.
improvisations
Qalamkari
Portrait painter
A geometric painting
Provenance
A painting of part of the countryside could be known as a scenic painting.
seapainting
A triptych.
'You see a person who paint wall' is not correct. There are many ways this sentence can be corrected: You see a person who paints walls. You can see a person who paints walls. You see a person who can paint walls. You see a person who can paint a wall. You can see a person painting a wall. You see a person who is painting a wall. Can you see the person painting the wall? Who is the person you see painting the wall?
A person being painted is typically referred to as a "model." In artistic contexts, they may also be called a "subject" of the artwork. If the painting is a portrait, they can specifically be referred to as a "portrait subject."
The point in a painting where the eye is drawn to is known as the Focal Point.
A tableau.
monotint
hieroglyphics