I ve heard about the @celfmagazine by this article. Checked their posts. Nice initiative. Hope it will really work for them and artists. May be they can check one of my old Project. https://steemit.com/art/@bidesign/versus-art-project-sculpture-vs-graffiti-2009
There are going to be many apps like this but good luck to you too, now following @celfmagazine too.