Moving into the middleground, with a mixture of windsor blue (cobalt blue) and lemon yellow, loosly apply uneven colour leaving some of the pink wash.  This blue green creates the shadowy colour on the grass which is influenced by the clouds and sky.  for the darks use Windsor Blue (Ultramarine Blue) and Permanent Rose (Alizarin Crimson) and also apply loosly.  Also apply these in your foreground as a foundation.  Now, add in some soft highlights for the next stage over the blue greens with titanium white and blue.
To add some drama to your greens, gently and sporadically add some cadmium red which is the complimentary colour of dark green.  It will add more drama and liveliness to your painting.  Don't over detail as we wish to keep the middle ground slightly distant.  The foreground details next week will help to enhance this effect.

Start with the lights on the mountains usina a pale violet made up of white, windsor blue (cobalt or ultramarine blue can also be used), permanent rose and a little yellow ochre, leaving the darks and some of the pink wash exposed.
From there, for the darks use the above colours with less white and more blue.
Soften the edges to create a diffused and distant look with a clean, dry brush.
Add in some gentle highlights of lighter versions of the same coloursby mixing a little more white and a touch of cadmium red to the original colours.
Moving into the sunlit background on the left and right sides, use cadmium yellow and white.  Once again leave some of the pink wash showing.
Add in occasional touches of shadow with cadmium yellow, white and a touch of whatever blue you used for the mountains.
Finish by blending gently where it meets the mountains to create more distance.

Step 1 is starting with the lights on the clouds, made of white with a little amount of cadmium yellow.  Apply loosely leaving small traces of the underlying pink wash coming through.  From there, add in touches of dark shadows on the clouds, made of white, a touch of cobalt blue and a touch of burnt umber and again apply loosely leaving traces of the underlying wash coming through.  Next apply the base of the sky, between the clouds and mountains, with a light blue made of white, cobalt blue (or windsor blue) and a touch of viridian green.  The green helps to give a more luminous quality to the sky.  Next go to the top of the clouds and graduate the sky towards the top of the canvas, getting darker as you go higher, with a mix of white and winsor blue or ultramarine blue, adding more blue to darken. Continue to leave small traces of the underlying wash coming through. You can also introduce touches of the blues from the sky into the greys to create a little bit more liveliness and drama.

Step 2.  Very gently using a larger brush, blend the edges of the clouds and sky.  From there, if need be, introduce extra touches of darks and lights to the clouds in order to strengthen. 
Keep in mind that the idea here is to create a nice loose sky so don't over blend or over apply the paint.

The aim is to use the image and interpret it to your liking, having fun with colour and texture on the way.  Use the image as a guide to help you define your initial structure to build upon.

Draw a light outline on your canvas with a pencil and then give the drawing strength by painting over the pencil lines with a violet (red + blue) wash thinned with white spirits.  Then, taking a larger brush loosely scrub in the shadows in the clouds and on the ground to develop more depth and allow you to understand the structure and light / shade of your composition.

The first stage of this painting will be a pink wash made up of white, with a little bit of permanent rose (or any red can be used), and white spirits.  Apply this to the surface of the canvas and allow to dry.

On Thursday 3rd June I will be showing you how to do the outline drawing sky so I look forward to seeing you then.