I'm just back from the new Mackenzie Thorpe exhibition of Station Posters in Middlesbrough.  I love Mackenzie Thorpe's work, and find I am always drawn to his paintings with really beautiful big skylines with puffy clouds - although the ones with shepherds and sheep come a close second (and when he paints both together, I'm in heaven! :-D).  I once spoke to him about how much I loved the cloud filled scenes he painted and he told me he got the best results when he turned the painting upside down so he could gain a different perspective on the work.  Reflecting on that on the way home, I started to think of this as being "Big Sky Thinking" (rather than Blue Sky Thinking) and how that would be a pretty good way to help you achieve the best results too.