Picture 1: The artist has used broad, striking strokes to create the hair, ensuring lost of dark values. To create the softness, shading, and flow of the face, the artist has used softer lines and incorporated blending techniques.
Picture 2: The artist used light pressure to create subtle forms, while still using a degree of shading and shadowing. This artist however chose to make the values of the entire piece much lighter.
The answer is all of the above. By making the element stand out in a spot that attracts the most attention, the eye will naturally be drawn to it,i.e focusing.
Answer: According to Hockney photography has it limits as it cannot capture time. He explains as it only has a singular point of view, and that photography is only good for mechanical reproduction.