So in this instance I'm going from the edge to where I want the first round of echoing to be.
To add a little more interest and to keep lots of curves, I'm adding a spiral here. You just spiral inwards leaving yourself enough space to spiral out again.
Simple isn't it?
Then just follow you previously stitched lines. Notice that the gap is not even. I wasted a lot of time getting my gaps totally even only to find it doesn't look great. It has no movement.
Sometimes if a line is getting too long or too straight, I'll stop and go back in the direction I came from.
Then on the next go round I have a little new curve to echo.

Here I've made the line to the right and behind the needle a little wavy. I'll probably exaggerate this wave with each successive round.
There one little area done.It's also nice to break it up as it gives you small areas of achievement.