I've had several questions about straight line quilting with a free motion foot, so I thought I'd do a little rundown of what I've learned by using this technique.
--It works very well for quilting specific sections of a quilt.
--It allows you to work back and forth, without turning the entire quilt in your machine each time you change direction.
--It gives your lines a free form, sketchy feel.
What to watch for:
--Stitch length. With a walking foot your machine determines the stitch length. When you are free motion quilting, it's all up to you! If you've done some (or any) free motion quilting, this isn't anything new.
I used each of these techniques about 50% of the time. Do what is comfortable and what works for you.
Specific to this quilt: