Hmm, lighting. Well, natural sources of light will always have
blue-ish shadows, so it helps to have the boxlight tinted blue (this colouration becomes more noticeable when the sun is closer to the horizon).
Other than that, more contrast often helps. Start with your darkest lights first and build your way up. That way, you'll be able to tell if you need to adjust your spotlights or boxlight.
In terms of colour theory (if that's what you were looking for)...
This tutorial applies mainly to photography, but to maps as well. The important part is this:
"There's a test that you can do for yourself in Photoshop or almost any graphics program. Create squares of complementary colours and compare their relative intensities. While Red and Green are roughly equal in their affect on each other Orange and Blue need about a 3:1 ratio for the same balance. With Yellow and Violet it's about 5:1. (Your mileage may vary)."
To summarize and expand at the same time:
Complementary colours = Yellow with Purple, Green with Red, Blue with Orange.
When using
Red and Green for lighting, a ratio of 1:1 (same amount of red as green) works nicely. The shade, saturation, and vibrancy of the colour should be determined by your map and what suits it best. This would probably work best in a sunset-map although Blue-Orange is the better complimentary pair for sunsets (even with forests).
When using
Yellow and Purple, you need a lot of purple and a small amount of yellow, approximately 5 times as much purple as yellow. I find using a very desaturated yellow with a very light yellow makes for a nice dawn colour.
When using
Orange and Blue, you'll need more orange than blue. Sort of like what I did in my screenshot. Most of the light is very blue and only a bit is orange.
Using this in relations to your map, it pretty much means use (slightly) more colourful lights, darker shadows and a blue boxlight - dark, desaturated blue. Try 0.105, 0.116, 0.141 (R, G, B) or 0.061, 0.082, 0.106 (R, G, B).