The Johnny English Reborn actress insisted that she did not want to copy other actresses' portrayals of the tortured spinster and had her own ideas about how the character should come to life.
"My fear is always I've been taking on something else that already exists. So I deliberately haven't gone through other versions or even old line drawings. I'm fascinated by the previous incarnations but will try not to compare. My intention is to be as close to my first impression of her," Anderson explained to BBC News.
"I had an idea for a grey which I didn't think existed," said Anderson of her contribution to the character's look. "There was a specific grey I felt her hair should be, which they were able to find. It's kind of opaque and translucent but at the same time holds light. It's not white, it's not too grey, it's just this middle non-colour."
Anderson, 43, also defended the fact that she is the youngest actress to have portrayed Miss Havisham on screen, adding: "Dickens doesn't qualify Miss Havisham's age specifically. If you add up the numbers at the time, it makes sense she would have been about 37.
"This is me, at this age, this actress being hired for a particular reason and honouring that. I'm not going to say, 'I'm not doing this because you should have hired an older actress'."
Great Expectations concluded on BBC One on Thursday night, finishing with a strong 5.92m viewers.
> Great Expectations Douglas Booth Q&A: 'The show is epic, rich'