So like 1 week ago, I challenged myself, using nothing except pen, it took a while, but well said, my first drawn anime char. All the tips are appreciated. My only purpose was that I am just too lazy to draw on an A4 Paper and color it so just used a pen on my tablet. My method was that the monitor was in front of me and I just looked at it, preparing for art olympics here.
Okay, first thing i would do. This will almost always make you better faster. Make a complete drawing, nothing sketchy about it, get rid of all the extra lines and make them as clean as possible and then show me it. It will look much better and I can help you better that way. Unless of course you want to do it that way then you cant really improve on a sketchy style on a pc, because it will always just look "ok"