Diagonal lines are one of the influential elements in an image and can create a point of interest. Apart from that, it can also provide depth to the image through perspective. Some photo references: quacK! by priskoskis Damnoen Saduak by Kaptah Row by historygradguy 4:3:1 by Jimmy su Untitled by piriskoskis Kayaks for rent by drurydrama Reading by Stephen Gray \ by Antonio Ferocious killer by Thomas van Rooij Connections by weltreisender2000