Peter Keil’s style was influenced by German expressionism. In the works from his early Berlin years, he mainly focused on typical big city settings and characters on the fringes of society. However, his style changed visibly at the beginning of the 60’s when he lived in Paris for a while and emerged in the city’s nightlife. Keil increasingly parted with his realistic approach and developed a new, much more spontaneous and dynamic painting style which he developed further during his years in London and finally during his time as one of the “Berliner Neue Wilden” at the beginning of the 80s. Since then, the use of intensive to lurid colours and the absence of realistic representation have become characteristic of his painting style. In his paintings, the colour is applied with quick brushstrokes and occasionally with impasto techniques . Keil prefers to paint human figures, portraits, big city scenes, landscapes and still life images of flowers.