Greetings, Planewalkers!
Just to let everyone know, there's one of those fancy groups set up on deviantART dedicated to Planescape art. Some of the gallery folders were recently renamed and rearranged, so if any of you have Planescape-related artwork, please swing by and submit it! Everything is welcome.
You can suggest favourites if you like, for sure, but if you join the group you can submit your artwork right into the group folders -- the Characters folder for character art, and the Torment folder for PS:Torment fanart.
As for your other question... the group is definitely a Planescape group, so while the aim is for Planescape-specific content, if you've drawn a "Planescapey" character that isn't really from any game, I think that would be fine to submit it. Still, it's not a group for all of Dungeons and Dragons, you know?
BUT! It's not actually my group. I can't speak for Eilidh on what she wants accepted or denied, so if you want to know if something is cool for inclusion, just submit it and Eilidh will add it if it's a go.
How doth it work? Do I have to use the "Suggest a Favourite" button, or is there another way?
Are you also interested in stuff that is not directly related to Planescape, but does fit to the setting (well, in my eyes, at least...)?
"La la la, I'm a girl, I'm a pretty little girl!"
--Bel the Pit Fiend, Lord of the First (in a quiet hour of privacy)