Colours lose their intensity when viewed from a distance since the intervening atmosphere introduces a bluish tinge, gradually blending all the colours together in the far distance to create a bluish or blue-grey cast, according to the lighting conditions.
A common fault seen in many landscape paintings, is that of making the greens in the distance as warm and powerful as those in the foreground. The problem can be resolved by continually comparing the strengths of greens in the foreground with those in the far distance. This is best achieved by using a view finder. (Figure 10)
Once you see green on the horses rear, then you are on the way to becoming an artist, as you are observing colour for its own sake. Conversely, you may never discover a green horse since they are white, dappled, grey, brown, black or any combination thereof.