I know this is an odd question but I am not an artist.

Hell I don't even pretend to be one on TV. 

I've gotten my script for a visual novel created and starting to search for free assests. Im also trying my best to make use of the Art Packs given to us. However Im wanting the whole game to gel and have a coherent and consistent look. My question is, what is this art style even called? I see it in things like concept art all the time but I've never seen a name with it. I can only imagine if i get a name to the art style it can help me searching for more free assets under CC searches.  Everytime i've ever seen it i've always chalked it up to a concept/digital/oil/sketch/beautiful type piece, but these aren't really helping in my search. 

So any help would be appreciated, please and thank you.