I know what it's like when you have a vision in your head of what you want to achieve, and when it doesn't turn out exactly right it's disappointing.
However, as someone who has no idea what your original vision looked like, I think the cookie turned out great! It definitely looks like Florence. Especially if this is the first time you have attempted something like this. Well done!
By the way, I have total hair envy after seeing that photo.