I often don't let out my "paint nerd" side but here's a glimpse...I work with the colour blue the MOST. All kinds of blue...The biggest question I ask myself before starting to mix the colours in the sky is: do I start with a warm blue (pthalo blue red shade) or a cool blue (pthalo blue green shade)? Each blue reacts immensely differently depending on what I mix it with and if I use the wrong blue the rest of the painting will be off kilter... and I've either been picking up on an interesting pattern or I'm imagining things...But recently, I've worked on a couple of early morning paintings and I've found that I'm often working with a cool blue and cool violet. For dusk blue skies I'm usually working with a warm blue and warm red. The coldest part of the day is just before dawn, and I find it interesting that the temperature of the environment and time is captured in the "temperature" of the cool morning blues and vice versa with the warmer blues of sunsets. This pondering may seem so subtle and specific to people who don't spend hours of their lives mixing colour, but paying attention to these tiny details can save me a lot of time, and it also convinces me that I'm so deeply obsessed with what I do that I must be on the right path in life! In the photo, I've lined up dawn scenes on top with dusk scenes on the bottom.