I did a class with Shari Blaukopf in Craftsy.com a few months back. And I really enjoyed her approach to watercolour sketching. Skies in particular. So I'm now following her blog and I found this lovely watercolour winter sketch she did with just three colours, raw sienna, burnt sienna and indanthrene blue. I tried to copy it and here is how it turned out. Will definitely use those colours again.