This link is a webpage of ROBOART the first contest about painter robots.
http://robotart.org/
the links below are webpages and reference of the winners of the first contest. 2016
1st place
http://mjhung.wixsite.com/robotart-ntu
2nd place
http://www.cloudpainter.com/index
3er place
http://www.patricktabarelli.com/wordpress/noraa/
4th place
https://en.wikipedia.org/wiki/EDavid_(robot)
5th place
http://hci.cs.umanitoba.ca/projects-and-research/details/picassnake-the-painting-robot