Although I have plans in the future, especially for the original Yume Series girls in both styles, right now Miki is indeed the only sprite on my Itch page that has multiple poses. If you look for Noraneko-Games on deviantart, there are some different poses for the older versions of my Yume Series characters, but the art for them is old and the poses only differ when given a new outfit.
I'll try to fast track new poses after I'm done with my current project, so let me know if there are certain characters you'd like to see more poses specifically for!