Yea! your artwork is pretty good! If you're willing, i have some suggestions to take you to the next step. you already know the characters, and already have the style down, now you need to refine your lines (strokes), and your characters form/anatomy.
Lines/Strokes: start with light sketching, and don't use short strokes. practice drawing the entire line as one line, and get faster. the faster and more solid you draw, your lines will look cleaner and stronger (or smoother, depending on the style).
form/anatomy: i would suggest a light pre-sketch using basic shapes to pinpoint the pose and anatomy of the body. look at photos and professional drawings and measure out how large they make things (how many heads to the body, etc.)
You really have a good start, taking what you see, whats in your mind and applying it to paper. now, refine your work with these suggestions and you'll be that much closer to your goal! and practice drawing real life (because what you see in real life allows you to mess with fantasy and make it believable)!
i hope this helps!! ^_^