In fact I had tried that...setting the white/dark/grey points and really, it made things worse....hence, why I did it "by hand". I'm sure there are those who would disagree with me, but I tend to find that setting the white/black/grey like that works well if you have well established points of colors to select from (i.e. white "whites", black "blacks", etc.). In this image, since almost everything was of similar tonal values, finding the "mid grey" is kind of like finding the proverbial needle in a haystack and I really wasn't happy with what I was coming up with.
At the risk of sounding rude, either way I just wanted an opinion of "does it look reasonably natural"...i.e. a simple yes or no would have sufficed or "too heavy on the reds" or "too dark/too light" or something similar would have been even better. I wasn't really looking for a tutorial on how to make it look natural. Since you posted that link though, I'm assuming that to you it didn't look right (yes/no?)...I'll take a closer look at it again in a day or two...thanks.