First of all it looks like your tension is way off. Sometimes just retreading, or brushing out your bobbins case will do the trick. But as far as you motion, that looks pretty good. Remember YOU are controlling the speed of the machine and the size of the stitches. What I generally tell students that have taken my FMQ classes, is to practice drawing a meander on a piece of a paper a few times. It kind of gets into your head what you want to do. And as far as the stitch size, picture a dot-to-dot in a kids book. If the dots are farther apart , the line is not as smoothly round. If there are more points, the line can be nicely rounded, even though the lines between the points is actually straight. It helps to remember that as you move your work around. If you stitches are getting too big, speed up the machine, and slow down moving the fabric. If your stitches are too small - move the fabric a bit faster. You are going for a stitch size about the same as you would piece with. Oh yes - remember to to relax and have fun!!