Medieval and Renaissance Christian and secular artists had no religious restrictions regarding depictions of Mohammed, and were free to show his face and body in their entirety.
Mohammed preaching, from a medieval illuminated manuscript, with historically inaccurate landscape and clothing (a common problem in medieval and Renaissance paintings, which usually showed fashions that were contemporary with the time the painting was made, rather than showing the costumes of the era depicted).
This picture is of an early Renaissance fresco in Bologna's Church of San Petronio, created by Giovanni da Modena and depicting Mohammed being tortured in Hell.
(Hat tip: brenda.)
In 2002, Islamic extremists plotted to blow up the church in order to destroy the image.
The fresco is in an inaccessible part of the church and is now only visible at an angle from a distance; this old black-and-white image is one of the few official photos ever taken that shows a straight frontal view of the figures.
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Colored Renaissance print showing Mohammed at court, with wildly inaccurate fashions.
The following two peculiar line drawings show Mohammed dressed in Renaissance-era German garb and not behaving as one might expect:
"His Wife Scolding the Drunken Mohammed," German woodcut print, c. 1481. Source (for this image and the one below): The Illustrated Bartsch. Vol. 83, German Book Illustration before 1500: Anonymous Artists, 1481-1482. Series title: Reysen und Wanderschaften durch das Gelobte Land / Travels and Wanderings Through the Holy Land. Presumably Mohammed is cursing the vines for producing the grapes that got him drunk.
(Hat tip for this image and for the following image: Brett K.)
"Mohammed Cursing the Vines," German woodcut print, c. 1481.