I don't know much about photography yet, but I do agree about the backgrounds. Maybe find some nice scenery to match the characters, like your In Your Nightmares and Target Aquired photos.
I do really like your shot of Medusa. The angle, pose, and background are all very nice. Your shot of Kenshin is also well done ^_^! The only thing that draws from the photo is the background but the pose is spot on. And I have to agree, I'm falling in love with the colors of your shots. Can't wait to see more from you
Doctor: I've been alone ever since. But not anymore. Don't you see? All we've got is each other!
Master: Are you asking me out on a date?