I recently did a weekend workshop on Tibetan calligraphy with Tashi Mannox. I would not say that I have progressed beyond the level of beginner, but after a couple of weeks of practice I think this is not too bad.
This is the mantra of Avalokiteśvara.
** oṃ maṇipadme hūṃ ||
The script is called dbu can, pronounced like 'uchen', and is from Tibet.