What I meant was that when you take a picture inside a house with 'normal' artificial light the picture is a bit yellowish and when you take a picture outside it's a bit blueish.
Some people say the best pictures must be made outside but they could just as well be made inside with artificial light(*) and some color adjustment in Photoshop. When you make pictures inside you need to decrease the 'yellow' of the picture and make it more 'blue'.
I agree with what ModernKiwi said, the light outside can be very harsh, something that doesn't always work on small scale figures. Artificial light can be adjusted to soften shades or make them more stark.
Making pictures of your miniatures isn't that easy. It's not always that you press the button on your camera and the perfect photo is taken. I normally take around 20-30 photos and end up with two I could actually use. Experiment with different angles, distances and lights, just as you experiment different painting techniques. Also experiment with Photoshop or other photo edit software.
Read tutorials and try them out.
There is only one important rule when take pictures of your miniatures,
never ever use the flash.
*With artificial light I don't mean the light in your room, but some extra spots. I use two cheap IKEA desk lamps for example.