Princess Celestia is 8 ft tall, and like this she weighs in at an unbelievable 780 lbs, plus 200 lbs of breasts, making her 980 lbs total!
I went with an unusual setup with the weights, because I didnt want them to obstruct the image, and those are in fact sized correctly to be 200 lbs each, meaning shes holding up 800 lbs plus the bar and part of the weight of her breasts.
I gave the lines a different treatment here, to reduce aliasing issues. It was especially bad because shes so brightly coloured. However, Ive also gone back and done the same for Luna, as well as fixing some minor issues, I replaced the file in the original tumblr post, so people can check it out.