Semiotics

Denotations:

The colour yellow makes the image happy look and gives the impression of the sun being out.

This picture makes you think of people struggling, one world is wealthy and the other is poor and suggests that the divide of status is important in this movie. 

The bold black title 'upside down' in between the two worlds is boldly showing a divide.
The black colour in the image gives the theme a more of a bold and mysterious touch onto it. 

Connotations:

The film poster shows a couple trying to hold hands, so love is the key feature to this poster. this gives you an idea of love being a struggle because they live in separate worlds. The main characters are looking into each others eyes, and the fact that they cant reach each others hands, shows a sad side to the movie.
The image shows a side view of the scene, a caption that impulses, direct attention to the different worlds and main characters. in conclusion, the image is happy due to the choice of colours however, theres a great struggle between the destined couple.