It looks way better than the WIP shot I had earlier... and I've now deleted that one... sorry, but I don't want to look at it.
Photoshop + tablet.
Celestia banishes Luna -not necessarily like the story in the show... This piece is part of the project I am working on.
EDIT: Enough people have asked me for a larger version... So I've switched out the file. Now larger (1920x1214). Feel free to use for wallpaper/posters. Please don't be a shitty person. Respect my work -- don't sell it... etc.