Preview of Final Results
First off create a new blank document (Ctrl+N) with size of 2000 pixels wide and 2424 pixels high.
Take gradient tool in the tool panel and choose linear gradient. We will fill the blank document with gradient color. Make sure to set the foreground color to #151723 and the background to #423e43. Fill the document by hold-clicking and dragging the tool from the top to bottom of the document.
Next place the fenestra image in the document.
Activate the free transform tool (Ctrl+T) to scale the image up. Position it in such way that the window of it becomes the main part of the background.
Proceed to alter the color of the wall. We will do this by just simply duplicating the original image four times. Set the original image to multiply blending at 100% opacity, the first duplicate to screen blending at 20% opacity and the other three duplicates to soft light blending at 100% opacity. Finally select all the layers and hit Ctrl+G to put them in a folder. I named this folder wall.
Here is what we will have:
Select the original layer within the folder and give it a layer mask. Take a very soft round brush to mask the upper part of this image as indicated by the red color in the screenshot.
Proceed to select the first duplicate layer and give it a layer mask as well. With soft round brush, mask area around the lower part of the window.
Here is the result should be:
Open the raven image and extract it from its background.
Add the raven to the main document. Scale its size and place it on the chair.
With the raven layer still selected, go to layer > new adjustment layers > hue/saturation. Make sure to give this hue/saturation layer a clipping mask by checking ‘Use The Previous Layer To Create A Clipping Mask’ in the new layer option box.
Here is the value of the hue/saturation should be set. Select the raven and hue/saturation layer and put them in a folder. I named this folder raven.