We can have an idea of the oud evolution by taking a look
over the pictures below, arranged in chronological order.

 

Mesopotamian terracotta relief's showing lute type instruments from the second millennium BC.

 

Muse playing a Lute(?), late 4th century BC., Greece

 

�nvention of al'ud, in Mecca, 685 a.d.

 

Stuttgart Psalter, ca.830 a.d.

 

Cantigas de Santa Maria, (Spanish, ca.1270).

 

Leonardo (Associate): An Angel in Red with a Lute (Before 1506)