Just because a scene might look complicated with detail does not mean it's hard to paint. This actually goes pretty well, then I start to refine the edges. See final shot for the finish. Value and mass shape relationships are examined in this painting. Don't rush to the detail stages until all the rough masses (and layers of the landscape) are in harmony.
Winter scenes are great for understanding value and mass relationships (foreground, mid, and background). Light, medium and dark feature prominently in this demo. Get a value chart out if you need help with planning the value groups of the masses.
Be prepared to adjust mass shapes, value, edges (soft or hard) and introduce a slight hint of color with the pale yellow for the sky and brown trees below. Don't overdo the color! This is a good lesson for learning to mix neutrals.
Watercolor artists can progress light (wet-in-wet washes) to dark, with dry brush techniques for the mountain texture. Burnt Umber and Ultramarine Blue will be a great mix for the grays. Add a hint of Alizarin + Blue to make things a hint of purple. Winsor yellow touches can happen in the sky for the pale yellow light. It's going to be best to put this in first with wet-in-wet washes -- be careful not to overdo the yellow! Use lots of water to have the sky pale. Let the sky dry to do the rest of the painting's neutrals.