Hi and welcome to
RP,
First off, let me say, "Good work." A couple of things catch my attention right off the bat.
First, your black point seems too high for my taste. It is often easier to black out the "lesser" details, but I feel that enhancing them gives the image more life.
Second, the skin and hair tones are a bit flat...they are quite well accomplished, but in glamour photography they usually have more saturation and contain a little more yellow than traditional photography.
Third, the image could use a little sharpening, particularly around the eyes, and a little more grain.
You can see my attempt at this challenge
here.
I am also attatching your image with the color and sharpening applied, you will notice that the difference is very subtle. You are on the right track.
Michael