Tim Vyner, a British painter, received a bursary to draw all of the twenty Monasteries on Mount Athos. Some of the work he did on his iPad. There is a film of his iPad drawing of Dochiariou on Vimeo, click on the link. It is both very instructive and meditative to see how the artist works and the painting progresses.
More on his website.
Bas Kamps/Herman Voogd