I'm trying to find tutorials for certain types of photoshop image modifications, but I don't know what words to search for. Things like "touching up" and "photo manipulation" aren't specific enough. Searching for "applying textures" results in a lot of subtle stuff that's not really what I'm after. I'm not asking for references to specific tutorials necessarily. I'm trying to figure out how to search for these types of photo modifications. What words should I google for? I'm interested specifically in things like:

* taking a photo of a real person and making half their face be made of fire (like this one: ![example](https://i.stack.imgur.com/CSiOs.jpg))
* taking a photo of a sword and making it look like the sword is all frosty like it was just taken from a freezer
* taking a photo of a wolf and making the face more angry and leathery.
* taking a photo of a book and making it look ancient and worn out.

EDIT:

Searching for "digital illustration" gave me a lot of good results. In particular it helped me find the following which is exactly what I was looking for:
 <http://psd.tutsplus.com/tutorials/photo-effects-tutorials/apply-textures-uneven-surfaces/>

I've also been watching Deke's tutorials. They've helped a lot as well. Thanks!