Your piece is still excellent, DP. You got a lot of the shoulder detail and the streaks in the ribbed areas. And there is a lot of subtle details all over it very much like how Big Chap looks. And when you consider you didn't simply enhance a pre-painted statue, you did an incredible job.
I'd be happy to own your piece.
In some ways, you should be thankfull you're not as neurotically perfectionistic as I am. I actually get anxioty about stuff like this when I think about what it would take to really pull it off, and how much time, and what if I fail. You want to know hell, be me on a day when I totally fail to achieve my goal.
When my first game plan for the under-dome head detail didn't work like I expected, I could not get out of my funk. But not giving up, and going back in to work on it (getting back on the horse, as they say) is why I can do this professionally.
You easily have the ability to do this professionally, and I can't wait to see what you do with that NECA PumpkinHead.