Congratulations on choosing a class tattoo. I also have the logo on my right upper arm, I suspect that quite a few people have it too.
I didn't know he was known as "Henry" is that right or was you joking? Anyway, good choice and I agree as it is Sabbath's symbol it is also a symbol for metal itself.
My design is all black with a slight red on the horns and on the tip of the tale, complete with star in hand. I am thinking about getting another Tat, for some reason I have the overwhelming urge to have a black rose bush close to it, curving and matching the lines of my arms. Green leafs and stems, with black roses. Don't know why this but I keep thinking about it??