Bonus post: How lighting affects your scenery colors
Lighting is very important to how your scenery colors look. One good tip is that whatever lighting you use for your layout, you should also use at your workbench. You avoid nasty color shift surprises that way.
Colors can shift dramatically between outdoors, and indoor florescent lights, and indoor tungsten lights. Florescents are getting a lot tougher to select because there are now cool florescents, warm florescents, greenhouse florescents, fishtank florescents, daylight florescents, and full-spectrum florescents.
Cool florescents ("shop lights") have a limited spectrum and have been known to even affect behavior in office environments where people have to work under this lighting for long periods. They give the sick green color to photos that is well known by photographers. Since they have a significant green element to their spectrum, they cause certain greens to shift and look quite different than under other kinds of light.
Some people (Tony Koester comes to mind) prefer the "cool mountain" look of the cool florescents, but I find them depressing. I prefer the warm sunshine look of tungstens, and since I model July and August scenery on my layout, the warm yellow look of the tungsten light looks perfect to me and feels just like a warm summer day in Southern Oregon (where I grew up).
Then you get into technical problems around lighting like the way tungsten bulbs run hot and heat up a room more than the same lumens of florescent lights. And while cool florescents are very cheap, the other florescent bulbs cost quite a bit more, with daylight florescents being especially costly.
On my Siskiyou Line, I use low wattage tungstens (15W and 25W) which keeps the heat down, and makes using tungsten lights practical. You can get cheap dimmers for tungsten lights, which is another advantage of them over florescents.
I take a glossy color photo of prototype scenery with colors I want to match, and match the colors under the layout lights to the colors in the photo. I suspect that's one reason people tell me my layout photos look like they were taken outdoors, like this one:
This photo was taken under the layout lights using a digital camera with a custom white balance matched to the layout lighting, so this is very close to how it actually looks to you when you visit the layout in person.