The German painter Emil Nolde (1867 – 1956) was one of the first Expressionists, and a member of the art group Die Bruecke (The Bridge). He is generally seen as one of the great watercolour painters of the 20th century, with themes usually centering on vivid, brooding storm-scapes and brilliant florals. Golden yellows and deep reds appear frequently in his work, giving a luminous quality to otherwise somber tones. The oil painting depicted above from 1910, full title being Autumn Sea VII, is a good example of his work. More on Nolde in the wikipedia article linked to below.