From the meaning of the dragon itself and the perspective of geomantic omen, I think the living room is a place where people gather, and it is a mobile, festive and peaceful place. It is suitable for hanging ornaments [including calligraphy] related to dragons, which is more in line with its meaning, conducive to auspicious spirit and conducive to the promotion of status and level.
In addition, there is a saying in Zhouyi that dragons should not be used. Therefore, ornaments with dragons are not suitable for hanging in the bedroom. If it is hung in the bedroom, it conforms to the meaning of "dragon" and will bring ominous atmosphere to social status, official rank and promotion.