I disagree. Your simple sketch is pleasing to look at - very much so. Though maybe your talent is wasted here. I wish I could free draw the way you have with this girl. You have created a new person with a few strokes of your pen. Full of contour, form, and burgeoning life. Unoriginal? I don't think so.
Hey, this is cool. I've been working on some drawing as well, and I really like it. It's very simple. I think if you gave it a little more contrast to help define some of the lines, it would be a tad better, but I can understand if you didn't because more contrast brings out the mistakes too (I do this a lot). If you have any more like this go ahead and post them, their really cool.