The base idea was to draw some bacground ponies with different armor and weaponry. So tribal Lyra with bow, medieval octavia with mace/crossbow, future Vinyl Scratch with bakelite-shaped energy shield, bass cannon and sword, and there'll be more :>
There's a friend of mine whos got inspired by octavia / dj-pon3, he wrote a small fic about it, a biger battle scene will follow that one.
You know, something kept niggling me on this, and I finally realized: You gave her a nice, rounded body instead of the twigs you usually draw anthro'd ponies in. Very nice! I think it makes her look a heckuva lot more awesome.