It can be done in many ways, but I'll show you my favorite - it certainly helps with coloring within the lines. :)
To practice satin stitch, first draw a simple shape on your fabric and use a backstitch to outline it. Then you'll simply go back and forth across the shape (I always like to start in the middle, but it's personal preference.) until it's filled in.
The two most important things about satin stitch are:
- getting as close as possible to the outlines so that your satin stitch looks nice and full - you can always go back and fill in those bald spots with seed and straight stitches, but it's easier to get it right the first time!
- don't continue your satin stitch on the back of your work. It'll waste your embroidery thread and make your work bulky! To avoid this, bring you thread to the front for the first time right next to the outline on the left. Then, bring it across, and down next to the right outline. Instead of crossing over to the left side of the outline on the back of the fabric, just bring the needle right back up next to where you just pushed it through. That way you're saving thread and time. :)
(I've included a photo of Nicolas Cage's eyebrow to give you an idea of what you can do without outlines!)
For more stitches, check here: