I made a short video to show you how you can easily make similar stars: https://www.youtube.com/watch?v=rICuMSCRv74
You can duplicate the starts (layers) by clicking [Ctrl]+[J] and you can change their size and angle by hitting [Crtl]+[T]. Just make sure to hold [Shift] while you change their sizes, otherwise the stars will lose their proportions.
The video is private.
Ah, sorry. It was supposed to be unlisted. Try it now.
I've watched the video. I've tried your idea and it works well. The stars are very similar.
I also removed some dusts.
Thanks for your help.
Last edited by Ana Clara; February 15, 2014 at 10:28 AM. Reason: I replaced the image