Some Inspirational artist links :

Craig Mullins ("father" of digital painting):
http://www.goodbrush.com

Calum Alexander Watt (great design and lines)
http://calumalexanderwatt.com/

Jaime Jones (awesome all around artist) :
http://www.artpad.org

Aaron Beck (great designer) :
http://skul4aface.blogspot.com/

Daniel Simon (vehicle designer for the movie industry):
http://danielsimon.com/

Steambot studios (collective of concept artists) :
http://www.steambotstudios.com/

Xiaoye Chen (great lighting and composition) :
http://www.supalette.com

Alberto Mielgo (awesome stylisation/simplification):
http://www.albertomielgo.com/

Nicolas Bouvier a.k.a. Sparth (great environment style)
http://www.sparth.com/

Robh Ruppel (Art director on the Uncharted Series) :
http://broadviewgraphics.blogspot.com/

Dylan Cole (one of the best environment artists / matte painter) :
http://www.dylancolestudio.com/

Thom Tenery (inspiring compositions) :
http://www.thomlab.com/

Neil Campbell Ross (great simplification ) :
http://limbolo.blogspot.com/