I happen too be a very big resident evil fan so here are some ideas:
Some originality in the map, perhaps some war scenes of the Raccoon Policeman Fighting the Carriers. Maybe watch a Tyrant mutate into a bigger B.O.W or have William Birkin experimenting with the G-Virus sample.
Perhaps you should show what effects the T-Virus has in hour stages. Withen a week of being infected with the virus you will turn into one.
Maybe have cenimatic scenes of the storyline, and a real good detailed background for the map..
Also a really good intro, im sick of seeing RE maps that just start and your mission is too kill, actually have RP's in it.
Perhaps a character selection with a wide veriaty such as: Chris Jill Brad Leon Bary Claire Ada etc.
Have multiple missions and tasks that must be performed too achieve victory, no more of just finding keys and killing.
Go look at my RE map threads there in the old maps in production projects, and if you need a storyline for your RE map apply in my RPG idea thread.