The reason why people feel that a painting is beautiful is because it brings a certain visual impact and visual enjoyment, so oil painting must consider the treatment of visual effects. But any excellent oil painting will have a visual center, which can be called the central interest point, which is the key to the visual sense of the whole painting.
For example, the face of a person in a portrait, or a person in a room. Almost all landscapes need a focal point, because without this focus, the viewer's gaze cannot be drawn into the painting, and the result is that the work will appear bland. But the establishment of this center is not so easy either. Even in the most beautiful countryside scenery, it is often difficult to find a perfect central point, because nature does not automatically provide you with a center of interest. In this case, you may need to subjectively create a focal point by artificially adding or changing more elements somewhere. For example, you can move a small house or a grove to a more advantageous position, or rely on colors and tones to highlight them.
Even when painting a desolate and empty landscape, you can look for a fence, broken door, or small shrub to focus on, and you can add a human figure to the middle of the picture, even if he does not exist in the real environment, but in order to construct the focus of the picture, this processing can be carried out subjectively.
The visual center does not need to have actual meaning, it mainly has two functions in the picture: first, it is a figure that can organize these landscapes into paintings; Second, it needs to find ways to direct the viewer's gaze to the picture. In oil painting, linear structures such as lines on the wall or ploughed fields can be the guiding lines that lead the viewer's attention to the focus of the picture, and the object that is the focus will itself be very eye-catching after carefully depicting the highlights and colors. A character in a landscape, if he is not the focus of the picture, can also play a role in guiding the line of sight, such as allowing him to gaze in the direction of focus, or even drawing a hand for him to point to the focus.