Step 1: First, sketch your landscape using a pencil. I tend to like 2B.
Step 2: Make a rough outline of your sketch using a very thin application of burnt sienna. Make sure to cover the shadows.
Step 3: Paint your sky using a mixture of burnt sienna, titanium white, yellow ochre, crimson red and phthalo blue. Add more titanium white if you'd like the sky lighter. The darkest shade should be at the top of your canvas. The sky should gradually lighten until the horizon line.
Step 4: Clouds must be completed while canvas is still wet. Use a combination of a little medium blue, yellow ochre, crimson red and mostly titanium white to paint the first layer of the clouds. Mixture should be a light reddish gray-brown. Start from the top, moving towards the bottom. Add a little medium yellow and crimson red to your original cloud mixture, and blend it in at the bottom of your clouds. New mixture should be grayish pink-orange.
Step 5: Repeat the first color mixture that we used for clouds, but this time adding even more titanium white. Start forming your clouds by painting the puffy highlights in a circular, dabbing motion.
Step 6: Continue to puff out your clouds in the same manner. The largest areas, or the ones closer to the viewer, should be done last. Make sure to maintain the undertones of the previous layer. Do not over-blend. This will remove the depth and texture of your clouds.
Step 7: Use a combination of yellow ochre, burnt sienna, and light green. Create the midtone color for your first layer of trees. Be careful not to completely cover the burnt sienna outline and shadows you have previously made. Allow some of that color to peek through.
Step 8: Paint your darkest darks by using a combination of phthalo green, more burnt sienna, and very little phthalo blue, using the original burn sienna layer as your guide. But again, still allow the original layer to peek through.
Step 9: Paint your lightest lights by using your original midtone mixture and adding titanium white and a little lemon yellow.
Step 10: Repeat steps 7 to 9 for your foreground trees. Paint the trunks last using a combination of burnt sienna, a little mars black, and a little phthalo blue. Add titanium white and yellow ochre for the highlights of the trunk.
Step 11: Using all the mixtures for your trees, and some yellow ochre, dab different sides of your paintbrush randomly and start texturizing the grass. You may refine this later once you've covered the required area to further give texture and depth to the grass. You will need to use a mixture of burnt sienna and mars black to go over the shadowed areas of your first layer, the burnt sienna layer.
Step 12: Add your additional foreground elements. Horses, cows, birds, etc. In this case I chose horses.
Step 13: Add finishing touches. If you'd like to add wildflowers to your pastoral scene, make little semitransparent dabs of white, yellow, and yellow ochre.