The question of creating a rendering composed of different works, some sourced from the Internet, while others originating from one’s own library of photos, graphics, etc..
Can the result be deemed original or potentially, copyright infringement for those elements sourced from the public domain?
For instance; this is the result of just such a manipulation:
The base image is one found on the Internet using the search phrase: scary landscapes,
Then adding an element taken from an original photo:
Then utilizing a photo-editing software, add a few elements such as an eery moon and some flash lightening for dramatic effect, finish the rendering with essentially a different story being told from the base image.