Oil pastels paint a sky that gradually changes color.

Oil pastels gradually depict the sky, as shown below:

1, pay attention to the position of the picture horizon.

2. The change of sky color;

3. Pay attention to the viewing angle;

4. Keep the color clean;

5. The virtual and real changes of cloud edge;

6. Don't over-paint the prospect;

7. Think like an impressionist painter;

Characteristics of sunset:

Sunset refers to the sun in the evening and also refers to the west of the mountain. Sunset is usually orange-red because it is close to dusk. The formation principle of sunset glow and sunset glow is slightly different. Astronomers have long discovered that the earth's atmosphere will scatter light.

187 1 year, British scientist Rayleigh proved that the scattering of short-wave light is much stronger than that of long-wave light.

Therefore, the short-wave light (purple light) in sunlight is scattered by tiny dust and air molecules in the atmosphere, which is more than 10 times stronger than the long-wave light (red light). From this, we can also know why the sky is always blue. At sunset and sunrise, the atmosphere penetrated by sunlight becomes thicker, and yellow and red light have the greatest penetration, so the sun at this time looks dark yellow and crimson.

Sunset refers to the process that the sun slowly descends below the western horizon, that is, at sunset, which is really defined as the time when the sun is completely below the horizon.

The time of sunset will change with the seasons and latitudes in different places. Traditionally, in the northern hemisphere, the sunset time is the earliest from winter to Sunday, and the sunset time is the latest from summer to Sunday.

But in fact, the earliest time of sunset should be 65438+early February, and the latest time of sunset should be the end of June. Even in the equatorial region, the time of sunrise and sunset will change a little during the year. These changes can be represented by daily trajectories.