Answer:
Elements
First is the shape, the 'NO' is much larger than the other words.
Second is their spacing, there's no enough space each words.
I also think that the texture of this signage art is smooth.
Principles
I think it's emphasizing the word 'NO' as it is like we really should follow what it said.
Second is the balance, the art is not balance because like I've said earlier the 'NO' is bigger.
