Let me tell you a dirty little secret: I had never used any drawing pen on my previous drawings. It was not because I don't like them; it was simply because I don't have one. Okay, I had it once but it had broken and I couldn't use it well. Then around a month ago I found one when I cleaned up my bookcase and I tried to use it and... woah.
With that drawing pen I created some doodles, one of them was this 'mini Cinderella' things. The one on the left is drew by drawing pen while another is drew by ballpoint pen. Of course there are some differences. As you can see, I can drew her legs curvier with drawing pen rather than with ballpoint pen.
What a regret... T^T