Hi,
Thanks to the suggestion from Steve Oldmeadow! Here, I would like to introduce the Tank's Art Studio (http://tanksartstudio.com )to you , hope it can help you some.
Tank's Art Studio currently have 35 people, and focus on 2D Game Art Design. This studio is now more than 3 years old.
When started, the studio focus on "pixel picture" for mobile phone, and slowly, we change our focus to "2d concept design" for 3D games and some 2D work of web games, where we accumulate a lot of experiences and designers. Now almost all studios dive into 3D modeling for the 3D video game is so hot, but we still insist to focus on 2D design which need real Art cultivation and inspiration.
Now, the studio form a team specially focus on mobile phone 2D game art design, for we believe this area stands for the trend. We will leverage our experience on 2D game art design to this new area to provide the most professional 2D art design and the most professional service to you who roll out to bit the big companies that controlled the market. Left all the art design work to us and you can keep focus on your idea and technology.
I think the work of this studio can fulfill gap on art design between you and big companies. I can say in proud that you seldom see so good art design out of App Store game Top 100!
Please visit the web to see the sample and reference price, and the process. I think the web at least can help you on building some basic concept of the work architecture of professional game art design. http://tanksartstudio.com
We will put our service on supervise from the forum to show our confidence and honest.
By the way, I am technical consultant of this studio who take responsibility to make sure the art design can match the technical requirements, and provide some technical knowledge to the studio. The web is built by me, sorry for my horrible art self-cultivation. :)
Best Regards!