I've always pondered to myself...
"What is it about breasts that I find so erotic?"
I think... that it's the 'ever-present' nature of them.
That they are always there, in our day to day lives...
So, this time, I put particular focus on that aspect.
Through trial and error I perfected the shape of the nipples,
the Montgomery / areola glands, etc. such that they are "real,"
but not TOO real to the point of being gross.
I personally am very satisfied with the outcome.