After that we should create a mask out of the layer: Layer ? Add Layer Mask ? Reveal All. Then apply the Gradient Tool again with different adjustments and black color to hide the visibility of the rays along the picture's edges:



Apply now the next command: Layer ? Remove Layer Mask ? Apply and change the layer's Blending Mode on Hard Light. Create now a new layer and group it out with the layer the rays are situated on, using the command: Layer ? Create Clipping Mask (ctrl+g). Paint it also with the Gradient Tool the same way we did earlier, but this time change the gradient's color:



Combine now the grouped layers: Layer ? Merge Down (ctrl+e) and apply the next filter shown here to the new layer: Filter ? Render ? Lens Flare, setting the flare on the rays' central part.



I've decided to change the background's color and the color of the dragon itself. It's possible to do that with the combination Image ? Adjustments ? Hue/Saturation (ctrl+u).