Peter, it is great o see you back to work.
I think the mantle is great, but I do tend to agree with those who have suggested narrowing down the top sections. When i first looked at the last pic you show, i thought the bottom pillars were thinner than the upper which to me is a nono. After close look, i decided the photography might have something to do with it. I, having been into the part you are hiding for so many years, have used little trcks to keep tops of chimneys from looking overbearing when fully exposed. In thecae of the chimney you show, with the high windows so close, it is difficult to create any sort of optical illusion. White washing the brick work is a nice touch and does serve the purpose of slimming the whole appearance.
Great job and again, it is so great to see you back at it. Keep it going.
Tinker