Re: Portfolio Feedback Request
You will find it very difficult to break into the games industry as a concept artist purely because they are not in demand and there are very few positions. AFAIK, we don't have any at the studio I currently work at.
Your best bet is to either expand your skills to computer art (either 3D or 2D) and/or expand the number of industries you would be willing to work in.
As dgb101, you need to network and get noticed by someone. Flaunt your skills online, use subject material that fan sites might be interested in. Very example, someone recently got hired for the next Tin Tin movie because he did a really good piece based on the current Tin Tin movie.