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Lighting is honestly half the battle with watercolor :) Colors look one way in natural light and completely different under artificial light. Yellow incandescent bulbs add warmth and darken cool tones, while cool LEDs or daylight will show off all the beauty of your paints in their full glory. That's why it's really important to paint under the same lighting where people will eventually look at your work - otherwise it'll look totally off. You'll paint something in dim light and then it looks completely different hanging on the wall.
There's also the thing with reflection - when the paper bounces light back and affects how you perceive the colors. White watercolor paper does a good job of intensifying this, especially if light hits it at an angle. That's why with watercolor you're often told to paint from the side rather than straight at the light source. That way you see the shades better and don't get blinded by the glare.
It's obvious advice, but it works - step back from your easel every so often and look at your work from a distance, under different lighting conditions. Outside in the sun, inside under a lamp, by the window during the day. That way you'll actually see how your watercolor looks in real life, not just in your head :) Colors with watercolor are super tricky anyway - they're transparent and depend on light more than with any other technique.
Lighting actually affects not so much the colors themselves as how we perceive them. Those aren't quite the same thing. The paint stays the paint, but our eyes and brain interpret it differently depending on the light source. Incandescent bulbs really do add a yellowish cast, but it's not just about "warming things up" - they also dull the contrast and make shadows softer. Under fluorescent light, it's the opposite: colors become harsher and cooler, which sometimes helps you spot tonal mistakes.
The key thing is to never work or evaluate your work under artificial light alone, especially if you're planning to show it in daylight later. I got myself an LED panel with adjustable color temperature and honestly, no more headaches. When you're painting under the wrong light, you can overdo the saturation or make the painting duller than it should be. The best is to work in natural, but stable light - not in direct sun, which creates harsh shadows, but in soft daylight from a window.
The key thing is to paint under the same lighting where the painting will eventually hang, otherwise you'll get an unpleasant surprise. I know someone who did all his watercolor work under a desk lamp, and then on the wall in daylight it looked completely different. Now he deliberately adjusts his palette to natural light, even when he's working in the evening.
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