as every style of art the emotive wave has its constant motives like: sadness, love, death, forest, body, flowers....
sometimes you think: who has started this style ? and you get in your mnd the cotemporary artists.
I looked deeper in the deviantArt, back to 2008 & 2009 when a lot of "emotive artists" from now were still "in the pre-school" :P when the following works already existed. Take a look at these roots...
The artists are no longer active, they're not popular either... they probably don't need your faves....