Most of his paintings are of religious subjects, appealing strongly to popular piety and illustrating the doctrines of the Counter-Reformation Church, above all the Immaculate Conception, which was his favourite theme. His mature style was very different to that seen in his early works: it is characterized by idealized figures, soft, melting forms, delicate colouring, and sweetness of expression and mood. The term estilo vaporoso (‘vaporous style’) is often used of it. Murillo also painted genre scenes of beggar children that have a similar sentimental appeal, but his fairly rare portraits are strikingly different in feeling—much more sombre and intellectual (an outstanding self-portrait, c.1670, is in the NG, London). He died from the effects of injuries he sustained when he fell from scaffolding whilst painting a huge altarpiece of the Mystic Marriage of St Catherine for the Capuchin church in Cadiz; the picture, completed by his pupil Francisco Meneses Osorio (c.1640–1721), is now in the city's Museo de Bellas Artes. Murillo had many assistants and followers, and his style continued to influence Sevillian painting into the 19th century. His fame in the 18th century and early 19th century was enormous. With Ribera he was the only Spanish painter whose work was widely known outside Spain and he was ranked by many critics amongst the greatest artists of all time. Later his reputation plummeted, and he was dismissed as facile and sugary, but now that his own work is being distinguished from that of his numerous imitators his star is rising again.