You should work more on the fonts. Fonts are a very special part of every graphic piece. The clean, the better. Another tip I can give is the composition. Details, details are amazing, but not that much.
The Shana sig is clean, but the font isn't fitting. The Kongou sig, on other hand, is too full of details. Try to find a balance between.
I hope it helps! :)
Kaideh 45 — Kudaranai 43 — Mitsumi 43 — Alejandro 30 — Harisu 20