OK...PhotoShop Elements is one tool. Another tool, that you may already have on your computer is MicroSoft PAINT. I used that program to create this tutorial!
Here is how I would stitch the curves I drew. I think of each quarter of the design as a leaf shape. the spine of the leaf is stitched twice (backtracking) then the soft "S" shape is stitched to get to the next corner. I repeat in my head "arc out, arc back, swing out, swing in" to get the rhythm of the lines.
1, 2 and 3: arc out, arc back
4 and 5: swing out, swing in
Repeat the shapes. Arch out, arc back:














