Hi Val,
First off, very nice scene. You've done an excellent job on the modeling/texturing details, and I think your basic lighting setup is also good...
...but I also have to comment that the final image is coming out very, very unnaturally yellow on my end as well. In fact, it's so yellow graded that it kind of makes me wonder if your monitor colors might be off (might be something to investigate).
However, I certainly understand that it might just be your personal taste as well.
That said, IMHO, it's kind of a shame as I believe your image has a lot more potential when finished with a more natural color grading.
P.S. If it helps any, I personally use a Gretag Macbeth "Eye-One Display 2" color correction tool which works very well (think it's still only like $250... and probably even cheaper on ebay)