It's Toko from Dangan Ronpa.
Nice drawing, I really liked it, specialy her crazy expression. You really surprised me.
About the clean picture...yeah,it's really hard if you just have a laptop's trackpad;
but maybe you can try using vectors in photoshop. That's very useful if you don't
have a drawing tablet. By the way... if you really like draw, my advice is that think
about buy, in the future, a drawing tablet, like a Wacom. My own jobs got be more
correct since I have one.