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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.
You may have to ask permission to use some of the photos. All photos are of plants, trees and vegatation in California, but there are some great pics for working on still lifes with (though nothing beats having the items in front of you).
hope this is helpful, if not feel free to delete it.