Carmilla, welcome to retouch pro. I am an amateur non-professional and not a glamor type of touch up person so I guess I would suggest you take what I say with a grain of salt.
I have a problem with the coloring of the iris. its about 90 degrees off. I believe that the specular highlight on the eye at the 12 oclock position will tend to color the iris at the 6:00 position and so the gradient color should be from the top down rather than from right to left.
The lower (6:00) part of the iris should be lighter than at the top because of the lighting of the iris which is in front and above the iris.
There is a tutorial on this site about this. CLICK HERE