Great choice of Red Oak and Walnut Celtic Knot Blank.
Do you "true" sand after your Scroll Saw Cut?
The second photo upper right insert looks a little wavy, (it might just be the photograph).
Celtic Knots, are filled with difficulties, and can require considerable practice to obtain consistant results.
Because of the contrasting timbers used, they highlight every slight deviation, and misalignment that may occur.
You are well down the path, keep at it.
Love your choice of Kit.
Brian.