Blue Moonlight Oil Painting - Next Step for a Large 4' by 4' Painting On Canvas

The first step for creating a successful piece of artwork is the concept and composition of the oil painting. Once that step is done I have started painting the background of the sky and the reflection of the sky in the water for this marine oil painting. Everything tends to look more grey in a moonlight painting so I have greyed down the blue with a complementary color (burnt sienna). You may think of burnt sienna as a brown but it is more orange than brown and orange is the complement of blue. Never use equal amounts of the two colors or you will get a muddy color. This painting is very large, 4' by 4' canvas so I am using big brushes to lay in the inital color.
Check back for my progress in painting a moonlit scene in oil paint.
Thanks, PJ Cook