Gustav Klimt, Life is a Struggle or the Golden Knight, 1903

Gustav Klimt, The Park, 1909.

Gustav Klimt, Trees, 1905-1912

Via: https://commons.wikimedia.org/wiki/File:Stasiak,_Ludwik_(1858-1924)_-_Alegory_of_Satan_(Lord_of_the_World)_-_MNK_II-b-3252_-_National_Museum_Krak%C3%B3w.jpg

Boleslaw Biegas

Boleslaw Biegas - Centaurs. 1925-29

Boleslaw Biegas (1877-1954)

1998, Mama, Papa and Granpa Gengar with their little Haunter by  Aya Kusube 楠部文, illustrations from  ちいさなゴースト (The little ghost) in the series  Pokémon Tales (ポケモンえほん Pokémon Picture Book)

Vintage pokemon art by Aya Kusube

Painting by German artist Zwintscher during the Jugendstil movement in the late 19th century to early 20th century. The Jugendstil movement is considered the German counterpart to Frances' Art Nouveau movement. Oil on canvas.

Oskar Zwintscher

1895

Oskar Zwintscher (German, 1870-1916) - Autumn landscape: Landscape with fir forest and deer

Cover from the German magazine Jugend illustrated by Angelo Jank, 1900.

source

East of the Sun and West of the Moon, illustrated by Kay Nielsen (1922 edition)

Kay Nielsen (1886-1957), 'The Vision', 1914