Dear Maki-Chan,
Your artwork is beautiful. Each picture has so much character and energy, they seem truly alive. They make me wonder what the story is behind them, especially the one with the girl in the shadows holding the little knife. Your colors are so bright. It's really amazing.
I think they'd look even better if you cleaned up your lines a bit, so they're not quite as sketchy. You can do this on the computer if you have a tablet or a good photoshop program, or by going over the lines with an ink pen (something not a ballpoint.)
One other thing that you could work on for future drawings is the characters legs. Female legs especially are made up of curved lines. They get small at the ankle, and wider below the knee and at the thigh. A good place to look if you're interested in practicing drawings like this is in a fashion magazine. The models are skinny like manga characters, but most of them still have the human shape. Just something to try.
Thank you so much for posting these.