Your "tweaking here and there" proves how much you wanted to get it right, and your attention to those details is one of the things that makes your sculpt stand out in the crowd.
I have seen the bust in the link you posted. Good for a mass-produced item and better than most, but there's something about the forehead and brow area that isn't quite right; yours is far better!
Now
that I'm looking forward to! Spock has been my favorite Star Trek character since the first episode aired in September of 1966 (yeah, I'm an old fart) and, like Kirk/Shatner, I've seen very few sculpts that did him justice. I realize it'll be a while, but I'm not going anywhere.
That, of course, leads to this question. Do you have any plans to make castings of these sculpts available to those of us who lack the talent and/or skills to create our own?