Hannier submitted this image taken with a Nikon D200, ISO 100, f/3.5 and a long exposure. This is a good attempt to capture star trails. The blowing wind has been captured with the tree branches blur on the left side of the tree while the right side is sharp. The small bit of a tree in the bottom right hand corner needs to be cropped out. As a nice star trail image using ISO 100 is a good choice, higher than 400 begins to introduce grain. Including the tree gives foreground interest and the colors work well between the tree and the sky. The star trails move nicely around the tree. There appears to be some ambient light creeping into the bottom of the frame but with this exposure it isn't too much. The blur in the treetop will either make or break this image depending on the viewer. For me it distracts from the star trails but I applaud your patience and obvious pre-planning to know which way the stars would move and placing the tree in a nice spot.