Make your artwork look like they're from an alternate universe. These Cyberpunk presets work with Photoshop (via the Camera Raw filter) and Lightroom. Download all 788 presets for 90% off.
Go to Filter > Blur > Gaussian Blur and set the radius to 140 px to turn the clouds effect into a mist one.
Add a mask to this layer and use a soft black brush to remove most of the mist, leaving the effect visible mostly on the bottom right.
Create a Color Balance adjustment layer to change the mist's color.
Make a Curves adjustment layer to make the mist's effect more visible a bit. On this layer mask, use a soft black brush with the opacity about 20% and 100% to reduce the effect on some parts below:
Create a Color Balance adjustment layer on top of the layers and change the Midtones and Highlights values.
Open the tree image. As it has a transparent background so just use the Move Tool to drag it into our main document and place it in the bottom left of the canvas. Apply a Gaussian Blur of 8 px to this layer.
Make a Curves adjustment layer (set as Clipping Mask) and reduce the lightness a bit. On its layer mask, paint on the right of the tree as it gets some light from the background.
Add the tree again to the middle section of the road and make it smaller than the first one.
Create a Curves adjustment layer to brighten the front of the tree a bit. Paint on its hidden side so it won't be affected by this adjustment layer.
Make a new layer below the tree one and use a soft black brush with the opacity about 36% to paint shadow of the tree trunk on the grass.
Place the tree again in the higher position of the road, resize it to be smaller and make shadow for it as done in the previous step.
Create a Hue/Saturation adjustment layer to desaturate the tree. On the layer mask, paint on the left of the tree to keep its original color.
Make a Curves adjustment layer to brighten the tree. Paint on the tree trunk to keep its shadow and contrast.
Add a Levels adjustment layer with the same purpose. The selected area shows where to paint on the layer mask.
Add the tree to the position behind the old man and scale it down to be smaller than the previous ones. Add a mask to this layer and use the Chalk 36 px brush to remove the right half of the tree. I've used the following settings for this brush: