I fear it's going to get a whole lot of ugly around here until I get this split comp thing down. I have no idea if this is good or bad. I'm working from Quiller's personal color wheel and using his suggested tube colors. For blue/green he prefers Phthalo Turquoise, which I happened to have in stock. For the analogous compliments I had Quin. Red, Alizarin Crimson and I had to make my own red/orange from Cad. Orange and Quin. Red. These are a combo of colors I never in a million years would've chosen for a painting. I threw in some white gouache to create a few opaque colors.
Once I have the colors I must decide how best to distribute them throughout the painting. Which colors should be neutralized? Which should stay pure? Lordy! On top of that, many other widely varying secondary colors can be created. For instance, Quin. Red and Phthalo Turquoise make a stunning blue/violet which can be used to neutralize the orange/red.
Note: I got the idea for this landscape from a photo I saw on Paint My Photo. I liked the strong horizontal lines. I think the straight line through the lower third of the piece is actually a bike path in reality but I loved the effect it lent to this landscape.