We will paint some shadows for the man. Make a new layer under the man and name it as Shadow. Use a black brush with the hardness about 30-35%, the opacity about 30% to paint the shadow behind the man.
To apply some shadow and lighting on the man, create a new layer in clipping mask. Name this layer as "Dodge/Burn". Set this layer to overlay filled with neutral color, 50% grey.
Now activate the Dodge & Burn tool (O) and with the Range set to Midtones and Exposure of about 15%, darken the part of the man's overcoat facing away from the light.
And with the Dodge tool (same range & exposure as the burn tool), brighten the front part which is facing the light.
Here is the layer set in Normal blend mode:
And here is the result in Overlay blending mode – 100% opacity:
To brighten the front part of the man even more, I created a Levels Adjustment Layer in clipping mask with the following values as shown below:
Let’s add some more details in the scene.
Open the ‘River’ stock. Then using a rectangular Marquee Tool select the portion of the river as shown below and import it on to your main scene above the old man group and using a free transform tool, scale its size as needed.
Apply layer mask and using a soft brush of opacity about 34%, mask away the hard edges to blend it into the scene.
I wanted to brighten the river so as to blend it with the whole scene. So create a Levels adjustment layer in clipping mask and apply the following values shown below:
Next, open the Stream 1 stock and select the stream using a rectangular marquee tool. Copy (C) it on to your main scene. With the free transform tool, adjust its size. Then apply the Warp transform tool as shown in the preview below:
After this add a layer mask to it and using a soft, brush of opacity around 40-45%, mask away the hard edges to blend it with the whole scene as indicated by the red highlights.
The river is too bright according to the whole scene, so create a Hue/Saturation adjustment layer in clipping mask to desaturate it a bit. Adjust the Saturation to -59.
Then open Stream 2 stock. Using the rectangular marquee tool select the stream only and import it into your main scene and using a Warp transform tool, tweak the stock as shown below:
Apply a layer mask to it, then pick the Brush tool (B) and with opacity around 50%, mask away the hard edges as we did with the previous stream layer:
To brighten the stream, I applied a Levels adjustment layer in clipping mask:
Then create a Hue/Saturation adjustment layer to change the colour of the stream to blend in with the ground:
Open Brook 1 stock and select the part shown in red and place it above the stream 2 layer.
Add a layer mask for it and with a soft brush of low opacity around 45-50%, mask away the unwanted parts as shown below:
Apply a Hue/Saturation adjustment layer in clipping mask and reduce the Saturation to -50 as the brook is too bright compared with the whole scene.
Next, open the 'Brook 2' stock, select the part shown in the preview below using a rectangular marquee tool, copy (C) it over your main document above the 'Brook 1' layer.