Oh, this week got away from me and I didn't see this weeks challenge, it would have been fun. The winners were amazing and so is the piece you made. I thought straight away ars nouveau style poster, and that was indeed the inspiration.
I love poster/graphic arts from the turn of the last century, always inspiring and the colour stories were always so good as well, probably somewhat dictated by the printing abilities of the time, but the tones are always so rich.