Hey guys

[tobz]

Hi there

There is Noah Bradley who does freelance enviros.
http://www.noahbradley.com/

There is https://www.artpact.com/ where people give reviews of companies that hire freelancers.
Here's a list of art directors http://illustrationage.com/adcontacts/

There is a difference between illustration and concept art too.
Though the line might be blurry sometimes.
You might get more time to finish an illustration for a book cover, while you get less time to do concept sketches.
Just food for thought.

You can make money doing either or both, whatever suits you. 

Just to mention, I'm not working in the industry. I just aspire to do so.