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Sorry, it is digital brush used in Photoshop and gimp.

))))) I will try to find this brush in Photoshop too... looks really great

just brush is not enough.
you need some other techniques.
i name it , you try to explore, if you need any help, i am always available .

  1. Displace filter.
  2. Brush property dialogue box.
  3. Filter gallery (use some stroke and artistic filters)
  4. layers and blending modes.
  5. Gradient map adjustment layer.
    You can start with this.

Ohh thank you so much!!!!!!!!! I will ask if I don't understand smth as I am not advanced user yet.