Very nice work, Please tell me: you made the photos with - AutoMode or P Mode? Because I don't see the flash in floor You use flash light?
in general panos are NEVER done:
with any settings set to automode with flash
instead, using the same manual settings for each single image and to compensate dark and brithnt parts you do use bracketing, so not only one image per imageposition, but several with different EV levels to extend the contrastrange