1. Using Polygonal Lasso Tool to make a shape and fill the color #45862C like this:



2. Continue to use Palygonal Lasso Tool to split that shape into 4 parts (each part in one layer)



3. Now the most important is to radiate light upwards, you will pick Gradient tool and set the color like this:



Ctrl + click on layer No.1, use Gradient to drag like the result below



Continue to apply step 3 to 3 remain layers, you will get the result like this:



4. Create a new layer, zoom out the right angle of the shape then use Polygonal to draw a selection like the picture below:



Pick Gradient tool and set the color like this:



Apply gradient to the selection, you will get the result like this:



Continue to apply step 4 to 3 remain layers, you will have:



Final step, you will make shadow around the logo, and this is my final result:

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