In my opinion, if you're going to take the time to stitch, it had best be visible.
I added a couple more circles and stitched into the wee hours, as usual.
However, I can't see much for my effort.
Yet, I do like white on white. I used an outline stitch because that's the stitch I like best and the raised effect is more visible. And, of course, a few French knots because I also like their raised effect. And a running stitch. The details please me, however, I'm not sure I like being so subtle...