I think, this is the one you are looking for:
Francisco de Goya (1746-1828)
Witches in the Air
Oil on canvas
1797-1798
31.5 x 43.5 cm (12.4" x 17.13")
Museo del Prado (Madrid, Spain)
http://www.artrenewal.org/pages/artwork.…
or this one: <<Le sabbat des sorcières by Goya>> (the Sabbath of witches). 1797-1798,
Oil on canvas, 44 × 31 cm. Museum Lázaro Galdiano, Madrid.
http://upload.wikimedia.org/wikipedia/co…
The painting shows a ritual of aquelarre, presided by the Great Cabrón, one of the forms that the demon takes, in center of the composition. To his around they appear old and young sorceresses that they give children him with whom, according to the fraud of the time, was fed. In the sky, at night, the moon shines and nocturnal birds see themselves (that they could be bats). In the series of which it forms part also is other five pictures of thematic similar and dimensions, that are: Flight of witches (Museum of the Prado), the spell (Museum Lazaro Galdiano), the kitchen of the wizards (deprived collection, Mexico), enchanted by the force (National Gallery of London) and the stone invited one (in whereabouts today not known).
The scene belongs to the aesthetic one of sublimates “it terrible”, characterized by mandatory the artistic one of the time also in the literary and musical preromanticism. One was to bring about an uneasiness in the spectator with the nightmare character. In this picture and the series to which it belongs accentuate the dark tones, and it is for that reason that environment adjustment is placed in a landscape nocturne. At the time of the execution of this series, Goya is working in the Whims (Los caprichos) with which it has one close relation. The subject of the witchcraft was of the present time between the informed friendly Spaniards of the painter, especially inclined to him was Leandro Fernandez de Moratín.
also, this one:
Francisco de Goya y Lucientes.
Title: The spell or The witches.
(1797-1798)
Oil on canvas.
43 x 30 cm. / 46 x 59 x 6 cm.
http://pintura.aut.org/SearchProducto?Pr…
But I really think is the first one.
Loving greetings.
