I work as a freelance Concept Artist. I work remotely (I am based in Poland), my rates depend on a project, but please note that I won't work for less than 20$ per hour, also I am not accepting revenue share etc as a payment. You can find my portfolio with some non NDA client work here: http://www.sambera.portfoliobox.net I have some experience working on 3D video games projects (you can see few examples in link above, those come from a futuristic RTS 3D game I was working on).
Please don't hesitate contacting me with any questions, I am looking forward to work with you!
Thanks for your time,