The idea was to have the star trails reflected but in practice I would have had to take another half an hour of photos to expose the light in the water correctly. I wasn't about to do that on this cold night.
has done a couple of great star shots here [link]
and here [link]
The method here is the same as my pic Shooting Stars. Link below.If you have questions check the coments beow that pic as I may have answered them already [link]
70 RAW photos. Base shot 3 minutes at F7 200 iso in half moon light. then 69 shots at F4 and 30 seconds. Batch converted in Rawshooter to 69 37mb tiffs.. do the math..over 2 Gig of pixels. Then combines using startrails.exe
Sounds hard but all this is mostly automated. Then I combined the base shot with the sky shot, cleaned up digital noise and adjusted levels and foreground colours.