Hanging pictures on the bedside can add elegance to the bedroom. The most common use of calligraphy in geomantic omen is to block "evil spirit", so it is best not to hang words on the bedside.
In the whole home feng shui, the bedroom has the most direct influence on a person, because you basically sleep in bed for one-third of the time every day. If the bedroom feng shui is not good, the impact should not be underestimated. Solemnly declare: the answer is for reference only, please don't be blindly superstitious.