Free Digital Painting Resources

http://www.ctrlpaint.com/
http://sakimichan.blogspot.ca/2011/04/eye-references.html (not bad references for eyes)
http://conceptart.org/forums/showthread.php?53941-george-amp-guo_sketching/page13 (some inspiration)
http://conceptart.org/forums/showthread.php?178068-Photoshop-Color-Wheel-(Free!)-Download (its a photoshop plugin that allows you to use the corel painter color wheel)
http://robaato.deviantart.com/gallery/34285302 (A collection of tutorials for digital painting especially cell shading and comics/ very stylized though)
http://browse.deviantart.com/resources/tutorials/digiart/dpadigi/corelpainter/#/d45trc7 (a collection of corel painter tutorials)
http://conceptart.org/forums/showthread.php?109701-What-the-deuce/page10 (some really great inspiration)
http://conceptart.org/forums/showthread.php?235088-Vielmond-s-silly-sketches-(June-20th) (more inspiration its important)
http://conceptart.org/forums/showthread.php?233782-Lane-s-Sketchbook/page7 (this ones cool this guy posts animated frame by frames of his works so you see exactly how he did each piece.)