Hi Phil!
I think you did a nice job. The lay-out is good. I only missed a bit of colour intensity (don't know if it is because of how you saved the image to post - jpegs saved to web tend to lose some saturation). You can try and make a curves adjustment layer on top of the image and push the midtones up just a bit. the colours will be more intense.
On the output resolution part, the best thing to do is talk to the printer, ask him what size he recomends you send the image on and, build the image on the propoer resolution. Avoid resampling the image to more than 40% of its size, because after that you start to loose sharpness and channel information, which will make the final output blurry, even if you do some sharpening.
cheers!
George Rutherford
www.seagullsfly.com www.fotolog.net/rutherford