Originally Posted By: Yury
Do you have a description of you postprocessing available by any chance?


that would take a long time, but it begins with how to get detail from the RAW file following the workflow explained here - especially the part about shadows, highlights, black and white point:
http://youtu.be/cCYtlzLr1Zo

then add some special star processing for the milky way - good example video for how to get there is this one:

http://youtu.be/FOAmP7A_x6c

beyond that there are some real filters (polarizer, ND file) and photoshop filters {NIK collection by Google) to modifiy the exposure, to reduce noise, sharpen, sometimes black and white, etc - here is an image taken with a real ND100 filter, processed in camera Raw, then Photoshop and with some Silverefex NIK filter for final output

Bear Creek long exposure