@David,
Thanks for the response. I didn't realize the pigmentation would wear off that quickly. I'm also concerned about grey hairs popping up and the tinting not matching in about ten years. I used Dr. Keane in Arizona and my results are comparable to yours. I wish I had more density as I have dark hair and my wife prefers it short, but there's only so much coverage you can get.
You achieved an excellent result though. Congrats on the progress and the accurate photography.