Create a new layer again and select the patterns2 brush of white color.

 

 



Select now out of the same set a new brush having the white color. (Create new layer)

 

 



It’s time to create another layer (Create new layer) and use on it the same brush: patterns2, having the color #2C7C76

 

 



Change the layer’s parameters: Fill 70%



Another new layer should be created. Use the same brush out of the same set, but this time of this color: #AF5CAE

 

 



Apply the indicated below layer’s parameters: Fill 30%



Finished!

View full size here.

Download brush here