To composite using Matt painting.

Chroma keyer.

Matt Painting.

3d scene.

Nuke

Photoshop.

Initially i have used photoshop to create a composition photo .Once the  file is exported i will import the file to the nuke.

After the file is imported the matt painting is break out into layers .

Once the layers are separated now i have removed the crop and merge then added premult to all the shuffle nodes .Premult is used to premultiply the RGB color values of an image by its alpha channel, and then i have added 3d cards to the to all the premult.

Then i have created scene and camera so that i can adjust those cards and place them properly.

After i have created the scene i wanted to replace the waterfalls so i have placed another footage in the card and connected the card to the scene. before connecting to the card i have used a chromakey to remove the green screen behind.

In the same way i have also used a footage of fog so that it looks natural, for that i have a chroma keyer to remove the green screen.

Later i have connected a footage of the birds and remove the green screen behind.

Final Output: