Hi Kat,
You had the white balance set to manual for the two outdoor photos and set to auto for the head shot. I'm assuming for the outdoor photos you selected one of the camera presets like daylight or cloudy, etc.
Forgive me for yelling: DO NOT LISTEN TO BRYAN PETERSEN!! Stop reading that book.
White balance: If you have something that is white (tee shirt for example) and you photograph it, the basic assumption is that it will be white in your photo. Let's do an example:
View attachment 15287
The Phil Pfeffer there is painted white. And in this photo of Phil the white paint is indeed white in the photo. If you open the photo in Photoshop and use the Color Picker to check the paint on the exhaust stack which is directly in the sun you'll get the values R = 235, G = 235, B = 235. Each color channel has the same value and that means the color is perfectly neutral -- white.
Now we add a twist: The color of the light changes. It changes throughout the day and artificial lights are all different colors. You've seen the color change during the day. It's warmer early and late and gets bluer midday. The sun is yellow and the sky is blue. On overcast days the color gets bluer. If you move into the shade on a sunny day the color of the light is much bluer -- it's from the blue sky. If you have a white boat and it's lit by overcast blue light what happens? The white takes on a blue cast.
In extreme cases like theatrical lights we want to see the rock star various shades of purple, orange and green -- preferably all at once. But when the light shifts color a little we want our white things to photograph white and all our other colors like skin tones to photograph the color they really are. This is getting the white balance right. Your photograph records the actual color of what you photographed. NOTE: It's completely OK and in fact very common to deliberately shift the color a little. People look good a bit warmer and a photographer who adds a touch of orange to a portrait is doing the right thing if it makes the subject look better. A lush forest scene with a little extra green may be just right. But these things are only OK if they're deliberate -- control versus out-of-control.
Next twist: Human perception is tricky. Some of the input data coming in through our eyes gets ignored as not critically important. Our eyes are physically sensitive enough to see slight color variations but our brains have learned to dismiss them if they're minor. (This is really good for Fauxtographers who try and sell fauxtographs). Otherwise it means you have a job to do to re-train yourself to see. Modern software can help a lot because we can use it to "paint by the numbers" as I did with the boat above.
The baby in your three photos is, as Keith noted, three different colors. In the one where she's being held up the color is about right. In the other two she's too blue and too orange.
Here's the one where she was too blue along with a correction:
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Practically from behind the camera what are your options:
1. Auto white balance fails 100% of the time. Your camera can't sense changes in light color.
2. White balance presets fail most of the time because the changes in light color are a continuum, not three fixed points. As for artificial lights, there's just too many of them and they're often mixed.
3. Your camera will allow you to set a custom white balance. This works great, learn how:
WhiBal - LensAlign
4. You can fix it after taking the photo.
....A) If you're shooting camera JPEGs this is not too smart.
....B) If you're shooting camera raw captures this works great.
To sum up that list you'll notice there are two "works great" options, one "not smart" option and two failures.
Back to your photo above: What I did was check the color of her skin. Human skin has know average values. That check confirmed her skin was blue. I added orange to get the numbers in range. I also checked the color of the background behind her which I assumed was probably neutral and it likewise was blue and after my adjustment it's neutral.
Joe