Sketch fro design prosess

I have to design Japanese money for my design class. These are some sketches.
From top left to bottom
Plant based, Temple based, Gaisha based, Sakura based (Charry blossom), Music based (Was random XD), Dragon Based.

I have more ideas and I'm going to be combining alot of these. I kinda like the idea of a dragon and Gaisha combo with Sakura accents, and a Tomoe sunrise design on the back.

PS: I know I probably spelt Gaisha wrong XD.