Rotate back the canvas (
Image>Rotate Canvas>90 CCW).
Next we shall apply the next brightness’ parameters for the changed layer (
Image>Adjustment>Levels)
Use the
Free Transform option to change the bitmap layer as the next picture indicates it:
Next we shall apply a new instrument – the
Pen Tool (P) to represent several white rays.
Each layer containing the rays has the same parameters:
Blending Options>Outer Glow 
Make a mouse click on the bottom part of the layers’ palette on
Create new fill or adjustment layer>Hue/Saturation 
Make a mouse click on the same layer on
Add a Mask option that is situated on the bottom part of the layers’ palette too. Select then the
Brush Tool (B) of black color to clean out that part of the picture situated above the ornament:
