Diana, great shots! I especially like #1 and #2, I love the eyes!
When I do stuff like this, I always take a white balance shot of my WhiBal
card. Then in the raw workflow, I correct my white balance to the card. The corrections are as easy as cut and paste, and I rarely have a problem. However you have to be able to put the card into your scene which is difficult in landscapes, but not here.
Another issue you may have in that shot is a varying color temp across the photo. For example, if there was something red that reflected some of the flash into only the lower portion of the frame, it can be difficult to remove. In that case, you may want to selectively desaturate that portion of the “white” background.