This tutorial is available as a PDF. Click here to view or download it
By popular demand, (and explicit force) I will download the whole tutorial here...step by step.
Only because I love paint.net and this community so much, and I have been a guilty lurker for so long.
So basically this tutorial will let you edit photos of people in high quality. The example photo is a pretty low quality, but the same process applies for all pictures.
For example, you can go from this picture