Comment on Hair Tutorial by Kiulani
In this version of photoshop that I'm using, the other dynamics option isn't there! and now I can't get the brush to look like how yours did! 
Hmm, that's odd. :/
I used Photoshop CS3 for this tutorial, so if you don't have the 'other dynamics' option, I don't really know another solution for this. I just googled it, and for other versions of Photoshop there is an option called 'transfer' (instead of 'other dynamics'), there you can find 'opacity jitter' etc... Maybe that will work. I hope this helps! Good luck!
I used Photoshop CS3 for this tutorial, so if you don't have the 'other dynamics' option, I don't really know another solution for this. I just googled it, and for other versions of Photoshop there is an option called 'transfer' (instead of 'other dynamics'), there you can find 'opacity jitter' etc... Maybe that will work. I hope this helps! Good luck!