As a Professional Photographer, I very much support this idea Dani!
Make sure your photographer understands what you want, and knows how to light you properly.
He or She should bring out your inner beauty reguardless of what the vessel looks like.
In fact a good photographer may be able to bring out a side of you, that you may not have known was there.
I have photographed many a individual with horrible health problems, and either the parents or the person having them done loved them.
I only wish you were closer, so that I and my wife could have the oppertunity to do them for you.
Keep trying, and maybe do a serch on the internet of this type of photography, so that he can see what you want.
I believe there is a real need for this type of photography, as this is not the first time this has been requested.
As I have said, I have done this several times in my career. It was very much a challenge for me the first time, but
then I got very excited, after seeing the joy from the client.
Usually it is one of the better pieces of art, if done properly, as there is such feeling and emotion flowing
from the portrait.