Great work overall, especially for someone with only half a year of experience. I'm gonna be a little brutal here because that's what you need to improve:
Be careful with your exposure and white balance. Relying on automatic modes will hold you back. For individual photos it's somewhat important, but when you're making a complete set, it becomes very important that you don't unintentionally have inconsistent exposure and white balance. Look at the thumbnails all together, see how the color and tone in the costumes and especially the skin aren't quite consistent within the entire set. You CAN make intentional variation, but make sure it's not accidental/unintentional variation because you're letting the camera guess the settings for you.
Careful with your framing. If necessary, force yourself to shoot looser, and do your final crop in post-processing. You're unnecessarily cutting off fingers and toes here and there, and it hurts the overall composition in some of them. Specific examples: Cutting off the hand and fingertips in the "Game Over" shot; cutting off the tip of Kokoro's toes in the shot where she throws Kasumi; shaving off the top of Kokoro's head in her "sultry pose"; cutting off the toes and ankles in "Get ready, fight!"
Learn about distance and perspective, and how it affects your shots. As a general rule, stand farther away unless you either have no more room to move, or you intentionally want perspective distortion. Here's a great read to help you get your head around it:
Careful with your horizons and verticals. I'm personally very picky about this. Don't accidentally tilt a photo, and don't intentionally tilt it unless you have a good, specific reason. (I rarely seem to get it right in camera, but I always fix it up in Lightroom).
Even if you have plenty of ambient light, a little bit of fill flash will brighten the eye sockets and give a sparkling catchlight in the eyes. If you only have the pop-up flash, go ahead and pop it up and just turn the power way down.
Great work with the specialty processing in the "Game over" and Kasumi's throw shots.
Can't wait to see what you're making a year or two from now.