Links to some of my favorite artists.

Here is a "small" list from my collection of artists that i gathered in time.
Hope you can find something here that will inspire you to work even harder.

http://www.martiniere.com/gallery/ - Stephan Martiniere is an internationally acclaimed Science Fiction and Fantasy artist. Epic Environments!!!!

http://cghub.com/images/view/109918/

http://www.ekundayo.com/about.html - ekundayo is a graffiti and traditional artist who works most with acrylics and watercolor

http://www.flaptrapsart.com/ - Richard Anderson - I really like his style. Great mood, atmosphere... His paintings looks like they are done in a flash with ease.
Blog - http://www.flaptraps.blogspot.com/

http://www.zhaomingwu.com/ - N/C

http://philippefaraut.com/portrait.html - Sculpture!!

http://www.kekaiart.com/ - Awesome Illustrations for games and books.

http://www.johnsingersargent.org/home-3-24-1-0.html - One of the Masters.

http://www.feral-kid.com/# - Freaky dude with mind-blowing fantasy.

http://keunchul-j.cghub.com/images/ - Awesome style.

http://sachinteng.com/ - Another crazy ass dude. From another world.

http://www.raphael-lacoste.com/acceuil.html - Environments!!!!

http://drigzabrot.deviantart.com/gallery/?offset=24 - Manga-Painter

http://medders.deviantart.com/gallery/?catpath=/&offset=48

http://www.hgjart.com/gallery.asp - more epic stuff

http://david-holland.blogspot.com/- One of my favorite Envi Artists.
http://concept-on-mac.deviantart.com/gallery/?catpath=/ - His Deviantart.

http://www.ctrlpaint.com/ - That dude is great even if you are more advanced illustrator. You can check the short tutorials that he makes. They are great!
http://www.conceptart.org/forums/showthread.php?t=172943&page=28 - His Conceptart.org page.

http://inspirationalartworks.blogspot.com/ - The name speaks for itself.

http://edgarcardona.blogspot.com/ - Animation style.

http://conceptart.org/forums/showthread.php?t=218185

http://www.danielclarkeart.com/illustrations-1/ - !!!!!!!!!!!!!!!!!!!!! AweFsome !!!!!!!!!!!!!!

http://jonmccoy.blogspot.com/ - Jon Mccoy!!

http://maciejkuciara.blogspot.com/ - Maciej Kuciara!!

https://daarken.com/ - Daaaaaaaaaarken!!

http://daverapoza.blogspot.com/ - Dave Rapozaster!!!!!! That guy is crazy! And he gives free tips on EveryFuckinThing on his stream, that you want to know about Freelancing.
Stream - http://www.livestream.com/fuckinartwithmrdelicious

http://www.lauffray.com/concept_design-images_6.html ...

http://sixmorevodka.com/ - Ladies and Gentlemen... I present to you... Marcooooo Djurdjeviicccccccccc!!!!! One word - Freak!

http://www.massiveblack.com/MBwebolution/index.html - no need for info here.

Wall of text... so tired... better go lie down a bit. :D
Hope you find something useful.

Cheers.