It's so short, I'll put it in 1 paragraph.
To improve the realism of your graphics, simply press ESC and go to the video menu. When you go there, click on the arrow right of multi sampling. Go to the last one, this should be The one with 4X multi sampling. If you select this and press Enter, you should see that if you zoom up to your character, you will sell more smoothness and less of those little edges.