Oh god this is such a difficult topic to decide on!
There's far too many different art styles I like in the art world.
I was pretty jammy as my art teacher was someone who used to work at Lionhead studios
(he worked on the original Fable) - I honestly wish I was anywhere near a good artist as he is ¦D
However I digress. I enjoy a wide range of art. In the past I've hoarded video game instruction books when I rented games (this was back in the days of super Nintendo when they used a lot of concept art in them as opposed to CG stuff/screenshots only which is what you get these days). Also I've actually gotten some game guides just for the concept art =X lol.
I'm probably not as into art as much as you are but I can appreciate really beautiful artworks that appeal to me like the two pictures I just posted. My favorite artist is Ayami Kojima because of the fact that she puts amazing detail in her drawings and her art style is self-taught.