I like that idea of sewing all around, and making a slit in the eyes/nose area to turn through.
Otherwise, you could make as you have, and topstitch all the way around, not just across the top, then it will look the same all around.
Cute, cute owl!
You might try sewing all the way around and then making a slit in the eyes-nose area, turn through that hole, and then applique the eyes and nose over the slit. Or you could leave the wings free, make a slit under one of them and turn through that slit and top stitch the wings down. It really looks great the way you're doing it though.