When painting a sky with painting acrylic, it is important to remember layered paint because the paint dries quickly. Clouds are usually part of the sky and can be easily painted on top of a layer based paint representing the sky. The technique used to paint depends on the time of day and weather conditions of the painting.
Day partly cloudy
When painting a blue sky on a very cloudy day, the sky and clouds can provide a framework or emphasize other elements of the composition. Near the horizon, it paints a lighter shade of blue. Add white to Prussian blue to create the right tone for the sky. Let the blue tones dry before painting the clouds. After the blue has dried, use a dry brush to paint the clouds. Moisten a very little round brush on the white paint. Slip the dry brush onto the canvas with a curling motion through the clouds. Add shades of gray to create contrasting values.
On a cloudy day in a darker picture, use white and black together to make a gray. Use a touch of red, green or yellow to give the sky an interesting glow. Paint the basic color of the paint first. Be sure to paint all the sky before it adheres from the clouds. When the first layer is painted all at once, this prevents color divisions and maintains a consistency throughout the sky. Make layers of clouds on top of the initial layer after it has dried. Also, use black and white along with a dry round brush to paint the clouds. The clouds should be a bit clearer towards the horizon as the dark objects appear closer than the clearest in the painting.
Dawn at dusk
At sunrise or sunset, the sun’s rays can shine through the clouds. It is important to match the color of the rays with the clouds of the sky or the colors that are behind the rays. Paint some rays brighter than others. Remember that the elements just above the horizon should be brighter. Use the red with the white clouds and add a very clear amount of gray to add value. The same sky will remain blue in some places, and it should be a lighter shade of blue for sunrise, and darker for sunset. Use yellow around the horizon to represent the rays of the sun. Again, paint the sky for the first time without the clouds, and then the layer of clouds in the sky.