For this next pair of eyes, I added stem stitch around the appliques for emphasis. This isn't a double layer of buttons but a couple of really cool ones I got in one of those bags of craft buttons you can get at Michael's, Hancocks, those kinds of places. It was really just pure luck, but aren't they great? Something similar might be available on cards.
And, no, you don't get to see the whole pieces - it's not Halloween yet.