See the result of shadow painting (as yours should looks like this).

Change blending mode of this layer to Multiply.

Step 26

Add new layer (Layer > New > Layer ..., Shift + Ctrl + N or marked shortcut). Choose big soft round brush and set its opacity to around 25% and color to light blue - #829ab6. Draw some light strokes on trees. At first, take care of trees which are far away. Light source will be in the centre of image, remember :).

For more gently effect, decrease opacity of this layer to around 50% and change its blending mode to Screen.

Step 27

Add new layer (Layer > New > Layer ..., Shift + Ctrl + N or marked shortcut). Choose big soft round brush and set its opacity to around 25% and color to light blue - #829ab6. Draw light stroke on tree in the left side of picture (the one which is close to viewer).

Step 28

Duplicate this layer - drag it and drop to "New layer symbol". Then transform it (ctrl + T - or go to Edit > Transform > Free) and fit it to tree on the right side - at first, flip it horizontally (by free transform or Edit > Transform > Flip Horizontal), then drag it and drop where is shown.

Step 29

Add new adjustment layer (Layer > New Adjustment layer > ... or marked shortcut). Decrease saturation, by adding Hue/Saturation layer.

Step 30

Let's cooler atmosphere. Add new adjustment layer (Layer > New Adjustment layer > ... or marked shortcut) with color fill. Then, change blending mode of this layer to Hard Light.

Step 31

Make just more lights from magical epic swirl, which we'll place. Add new layer (Layer > New > Layer ..., Shift + Ctrl + N or marked shortcut). Choose soft round brush, around 50px. Set its opacity to around 50%. Use #06a999 color and draw strokes of light on characters and trees.

Now, change blending mode of this layer to Soft light. It will be looking like diffused light.

Step 32

Prepare your picture to magical swirl - make frame of particles. Drag and drop "background_61" to your file. Choose big, soft round brush and mask everything, beside right bottom corner of picture. Trust me :).