After we can in and I uploaded the photos, I figured out that I was changing the ISO and the shutter speed, but I wasn't changing the F-stop.
It was a very sunny day, and we were outside between noon and two p.m., so the sun really was at its brightest. All of my photos turned out with a blue tint -- the temperature was off on all of them, not warm enough. I adjusted the photo above by maxing out the temp. to the warmest setting because I liked the effect. But it's not very natural-looking, of course. I'm still not sure what I should have changed to fix that while shooting, though, and of course I don't want all my photos to turn out that way, so I clearly have some research to do!