To start off, this is really good. I adore the bright colors. They really make this catch your eye.
I think that it would be a good idea for you to get a better scanner, because it can really make or break your artwork.
And kudos to you for adding a background. I can tell you put a lot of effort into that.
I love the girl. Her face, body, and hair are excellent. I love the way you drew the wind blowing her clothes and hair around. Its really pretty. And her face is so beautiful.
I can tell you have a little more trouble drawing guys, as most people do. Those darn men. You're well on your way though. I respect that you actually gave him lips as well. A lot of people dont even try to give thier men lips. I would suggest studying the anatomy and hands of men, as I would say thats what you're struggling on the most. Everything seams a little squished to me. But dont think that you didn't do an excellent job, because you did. I'm just being picky.
Anyway, great work. This is really stunning.