Reading Subdued Shelby topic, I have come to this post to take a look at your photos. I liked all of them and I have taken the liberty to edit one of Shelby's photos, just for the fun of it. I hope you, or her, don't mind that.
Furthermore, I think you will not agree with me on this edit, because it seems you do prefer a more natural look of your subjects. Nevertheless, consider my glamor/fashion version of Shelby's photo and (please) ask her opinion.
Bear in mind that's a fairly quick edit from a low resolution file.
With some more time to spend and a bigger file, results should be better in proportion. You may notice also that I have changed white balance to be more in tune with a more warm look you would expect from a Texan girl.
Also the crop is a bit weird due to the fact that the t-shirt logo must be included in the image.
Regarding WB, if you shoot raw you can easily adjusted it without the need for gray cards. That, of course, doesn't mean that Jeff's suggestion isn't valid and a good one.
Lastly, you are really a lucky guy, being blessed with such beautiful daughters. I guess you already know that, but let me say it as a compliment. Congratulations on my behalf.
Cheers.
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Rupert, I'm now forced to upload photos to the forum gallery as I don't have any space left for attachments and I don't want to put the photo on my personal album, as it's not a photograph taken by me.
As a workaround to this annoyance, I have uploaded your photo to my PF gallery, so I can post it here. Nevertheless, the gallery photo is credited to you and a reference is made in the comment section, stating that it's only an edit of your original photo.
Should you oppose to this procedure and I will delete the photo. Just let me know.