As for "one Daffodil", that one is really nice...but we differ on the saturation of it all. I would have brought it down a tiny bit also.   This TomDart comment if nothing else shows how critical the fine line in this technique actually is...and that it all depends on the individual viewer.  We will likely have very different thoughts on the same image.  Well, we do already!

I suspect I will do only a few "selective color" images...truly preferring eiher bw or full color in general.     As for my posted shot, I would not up the saturation since when I did play with that, it ruined the shot in my view.  As for your image, I have not seen it with less saturation and might very well post as you did after playing with it.  Who really knows.    

Your thoughts are as always, accepted with thanks.       Tom.