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I've made a tutorial like this one some years ago but it was really short.
Thanks to my friend
and her tutorials which helped me to remember that I had to make this tutorial again for a while!
sorry but I won't translate it. I miss time, it's already hard for me to make such a tutorial since I'm french and not english speaker
Sorry about the possible mistakes.
PS: some examples of the brushes bellow have been downloaded a long time ago by me or some collegues. If you ever know who made them, please tell me so I can credit them