You will need:
Begin with the sky: carefully wet the paper in the sky areawith the clean water and apply the watercolour. The violetgrey colour of the sky is made with cobalt blue hue mixed with cadmium orange, the bottom part of sunset - with Naples yellow and rose madder, the splashes of blue sky in the centre - with phthalo sapphire blue. To make it more realistic add a drop of rose madder to the upper part in thegrey wash. After finishing the wash dry the paper - youcan do it either with hair dryer or naturally by waiting.
Start working with the base colour of the snow - I've chosen a mix of ultramarine and cadmium red orange in distant mountains. Approaching to the nearest mountain, the colourused here is the previous mix of ultramarine and cadmiumred orange with a little cobalt blue and rose madder. The closest peak, covered with snow, should remain just white paper.
Now begin painting the rocks and shadows on the distant mountains. For these rocks the colour is a mix of ultramarine and indigo. Than use the same colour for just a few dots on the tops of the far mountains to create the feeling of shadows. For this part, you can also use the dry-brush technique.
Now move to the stones in closer mountain range. The technique is the same, the colours here are mix of indigo and sepia.
Work with the closest peak, covered with snow. The snow would be just white paper, so it's critically important not to cover it all with any color - just paint a little shadow on the snow in the left edge with mix of ultramarine and cadmiumred orange. The big rocks are painted with mix of sepia and transparent brown. After you paint this, cover all of your work excluding this white area, with useless or unnecessary sheet of paper and splash the watercolour with the same colour. Let it dry naturally - if you use hair dryer on this step, dots of paint can crawl away.