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Challenges of the week give artists the opportunity to create new and fantastic art based on a weekly theme set by the challenge moderators. They are also a great place to develop core skills.
Being featured on ConceptArt.org can get your artwork viewed by millions of artists a month including big industry leaders.
Artchive - You should check this out!
Just peruse some of the names on the left of the screen on that site. They have an image viewer that gives you an incredible closeup of the art.
"As iron sharpens iron, so one man sharpens another. Unfortunately the resulting sparks set fire to any nearby artworks."