a scarf is related to illness, i.e., it's a warm item that protects the neck from colds, etc.
a beggar is also likely to be sick with something, because they all are sick.
the second artwork is already clear.
and an airplane can actually represent a phobia, because some people are afraid of airplanes. as a result, we connect the illness with the airplane and get a phobia. I don't know why an airplane is needed here.