Exotic subject (to those of us not lucky enough to be painting in the Southwest), self-assured pose, vibrant color, all instantly reminded me of Harley Brown's work. Given the venue in which you work, you're likely already personally acquainted with him and are aware of his
"Harley Brown's Eternal Truths for Every Artist", at pp. 116-117 of which you'll find checklists of over 30 areas to review and reassess when self-analyzing work very similar to this.
Thanks for reminding me of the book; it's fairly new, and I need to remember to re-read it at least a couple of times a year. You note that you are "at the crossroads" of a portrait career, and even Brown tongue-in-cheek's his own history of trials and errors, assuring us that he's saved us years of hard work with his book. I find it pretty hard to argue with him.
Best of luck,
Steven