The artist is using the appeal of pathos (emotional response). They play on the viewers association of the sky with endlessness, as it is often described as such. Additionally, most people associate the sky with birds which are used as mascots which hold value for freedom, like America's bald eagle. Lastly, people have an involuntary reaction to positive stimulus by smiling.
The space below would need at least 100 points to do this, this is a whole essay bro, how
Answer:
the two important components when creating implied texture are shadow and light