Graffiti is messy but at the same time, it is tidy and cool, Blended colours and contrast.
some artists are Banksy,Jean-Mitchel Basquiat,Lady Pink,DONDI,Vhils and Cope2
some materials they used are markers of most commom spray paint
this type of art work is very different to van gogh beca use he did lots of post impressinisim stuff like this and graffiti if naughty and looks different with lots of colours