In the recent launch of the new Surface Pro for the Taiwanese market, Dr Nelson Chu, creator of the Expresii painting app, was invited to demo Expresii on the new Surface Pro:
http://www.expresii.com/blog/expresii-microsoft-taiwans-new-surface-pro-launch
Expresii is still new to many. If you haven’t heard of it, check out the following process video and see that Expresii actually surpasses all existing painting apps for its ability to render natural-looking ink in real-time and high resolution:
Its revolutionary Hybrid-Vector-Raster rendering makes Expresii great to show off the gorgeous 28" screen of the Surface Studio:

The ink flow is so natural that you have to see it to believe it:
You can find out more about Expresii at www.expresii.com. In particular, read its blog for discussions of related digital painting technologies and more.