@samiluu just google Versailles palace, since I'm curious, but the building background I made it with random villa on Internet as a model. The clothes is random too. If you see the cover making, you will see I draw them naked first, since clothes is always hard to decides. The clothes can't be too modern since it's old era setting but I like to mixed current fashion details too, anything that look good and not too weird for the story setting time.
anyway, nice to know that my drawing style actually catorize to one of style that already exist.