That looks great. Back when I hand quilted I never ditched. I always quilted 1/4" away from the seam line. I used 1/4" painters tape to mark. Laid it down right next to the seam line and hand quilted right next to the tape. I could reuse a piece about 4 or 5 times before it lost all adhesion capabilities.
Here is a link to my tumbling blocks quilt where you can kinda/sorta see what I am talking about in the first picture
Tumbling blocks
Here is another one of my handquilted quilts where I also used painters tape along with several designs I actually marked.
Hand quilted Mariners Compass WIP