One of the wonderful, non toxic alternatives for liquin or other mediums is M' Graham walnut alkyd medium. Also for cleaning the brush as you paint , please buy SoySolv ( Daniel Smith has on sale) and the the deep cleaning use BrushFlush (Amazon.com)
Finally, here is my latest little painting , a demo for my "Atmospheric Perspective" class .
It't called "Teanaway Valley". It's been "Daily Paintworks" FaceBook pic of the day- a second this month - Woo Hoo !!!
It's for sale on FrankandDunya.com