Temple interiors are usually covered with frescoes and often hung with painted banners, or tanka (thang-ka). For the preparation of the latter, a taut cotton cloth is impregnated with a mixture of chalk and glue, rubbed smooth by some suitable object; for example, a flat polished stone. A religious painter trained in the tradition draws in the outline, often using printed designs for the main figures. There is no scope for originality so far as the iconographic details of divinities are concerned, and, thus, such painting is a highly skilled craft. For decorative details--for example, flowers, cloud effects, rocks, and groups of devotees--there is wider scope. The tradition of fresco painting and temple banners certainly goes back to that of the great Buddhist monasteries of northwest India and the Ganges Valley, but these Indian origins of the 9th to 12th centuries are now entirely lost. The Indian Buddhist paintings of Ajanta are of a much earlier period (up to the 6th century AD), thus predating the great increase in the Buddhist pantheon and in occult symbolism typical of the later Indian Buddhism received by the Tibetans.

Central Asian styles certainly reached central Tibet well before the 9th century, but, after that date, it was India and Nepal that were to have lasting influences on the development of Tibetan art. In more recent times, especially from the 18th century onward, Chinese influence became noticeable in the details of paintings, particularly in the freer but still balanced arrangement of the main figures and the use of Chinese-style landscapes as subsidiary decoration. With the disappearance of Buddhism from Central Asia and India from the 12th century onward, Tibetan art developed as a style exclusive to the Tibetans, the Newari Buddhists of the Nepal Valley, and the Tibetan converts of Mongolia.