Typically I will look at brightness and contrast before I do the color balancing. In this case, the brightness and contrast are not too far off, so I wanted to get the colors a little closer to real before I changed them (the yellow makes the picture in general look a little dimmer to my eye, and I wanted to get rid of this before messing with brightness). As in the first photo, I'm going to use the Color Balance command. See the screenshot below:
The photo has a distinct yellow cast, and the colors are faded. For the yellow cast, I used the color balance command. The original is on the left above, and the balanced photo is on the right. I clicked on the Remove highlight in the color balance dialog box above. This brings up a color picker dialog, including a sampler icon to sample the color you want to remove. I clicked on the sampler, and then sampled the border of the photo (I'll crop the border out later - I left it in just for this purpose). This essentially tells picture window to remove the color cast in that area, and bring it to a neutral color (white, in this case). As you can see on the right, the colors look much more realistic (though faded). The image so far:
Now that the color is better, I think the picture could use a bit more contrast, and the face is a little too light, so we will correct the brightness.