Make a copy of the last layer, changing on the made layer’s copy the next parameters: Blending mode-Lighter Color
Blending Options>Gradient Overlay

 



Using the same instrument, draw now an inclined line which shape should be corrected again with the Convert Point Tool.



The layer’s parameters: Blending Options>Gradient Overlay



Gradient’s parameters:



Blending Options>Stroke



Gradient’s parameters:

 



Make eight copies of the inclined line and choose the Free Transform option to place the copies as it is indicated below:



Hold on Alt button and make a mouse click between the layers that contain the inclined lines and the layer containing the horizontal line (on the layers’ panel). As a result the layers with the inclined layers are applied in the limits of the horizontal line.

 



Start representing the Christmas tree now. Firstly we’ll take the Pen Tool (P) to represent the tree’s top that may be corrected with the Convert Point Tool.