Wildstyle is the most popular and hard grafitti style. Wildstyle, thats how letters merge and became one big picture.
Sometimes painter use 3d elements.
Did you see letters in there? No? Thats normal, relax. Even skilled painters can't see letters in there.
Sketch drawing takes a lot of time, need you skills, and silence to work. And if you already paint on the wall, remember, no mistakes! Thanks for reading, hope you enjoy it)