Step 16 - Shadows

Now the shades, for this I used a soft brush with 50% of opacity and then I add some Gaussian blur, also the layer has to be in soft light:

Step 17 - Then the lighting

To make lights is the same as shadows, using a soft brush, then add Gaussian blur and use the layer in soft light as well. you can add several layers to make the image brighter.

Step 18 - Standing out

To make the model and stones stand out, used a smaller brush, and less Gaussian to create this effect.

Step 19 - Some strokes here and there

I used strokes with the pen tool to achieve a better lighting details. Make a strand in every detail of the model and the bg using a small brush, and then use the option brush simulate pressure.

Step 20 - Changing the colors

To change colors you can used photo filters here I used a warming filter. with 50% of fill and opacity.

Step 31 - The Gran Finale

Used channel mixer to end with the lighting effects. remember that the layer has to be in soft light and I apply 80% of opacity. And that's it. We are done.

Final Results

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