Cracking start Duncan - welcome aboard m'boy!!!!
Looks like you've sorted that guiding problem out too.
Criticism (constructive, mind!!) - colour balance is very blue as Matt said.
Looks like you've clipped the red channel quite a bit - open PS > Levels, then check out each colour channel individually. You'll notice that the curve of the red channel is shifted way to the left - part of it off the chart. Go back to your original and play around with each colour channel so that each curve is as close to the left as possible without cutting off part of the curve.
Does that make any sense? This is a strange hobby!!!
My homey Ezystyles says it better...(
)
http://www.ezystyles.com.au/photoshop.html
In Eric's tutorial he's manipulating the complete RGB image in Levels - get your hands dirty a little and pull down that "RGB" menu and play around with each colour channel individually. You'll find you've got much better control of the image that way.
Image is a wee bit noisy too - more exposures and a decent noise reduction PS filter will help.
I use Noise Ninja (downloadable trial available)
http://www.picturecode.com/
Tried to play around with the 195kb image to bring out a little more detail (hope you don't mind) - just tweaking in PS using the above tools. Brought out a bit more detail/colour but a lot more noise too!
All the best
Doug
