That is tiny! Did you use pre-printed Sashiko panels? I recently did a bunch of Sashiko for a WIP and ordered the preprinted blocks so I could grow accustomed to the proper stitch size. I wanted to go much smaller from my hand quilting days. After doing several I did a block that I marked the design myself. I had to work on not going too small with the stitches. I really enjoyed doing it and even did a couple of pieces with some fancy sparkly thread. Sashiko can be addictive.