True that, but this seems to be a raven (see below)

Yeah, it has some "mechanical" features and textures, because it's an artistic rendition (not by me, though) and not meant to be lifelike :)

I'm no ornithologist, but that's what I've learned a pretty long time ago, that you can't really tell them apart reliably.
For example, you can find ravens across the whole northern hemisphere basically, and that alone accounts for some phenotypical differences and the division into subspecies etc..

Here's a short list, one of the first things I've found, just for the common raven, if you want to read more :)

https://en.wikipedia.org/wiki/Common_raven#Classification