
It's really difficult to find a matching head for it. The 21cm Obitsu heads actually look good in proportion but the neck know was to big. Coincidentally, they fit just fine with the 27cm Obitsu anime heads.
To make the 27cm Obitsu anime head match, I sanded off the bottom of the chin to match the cartoon aesthetic. Here's a different girl with the same exact face up on an actual 27cm body for reference.

It's a shame the S and M bodies with the tiny hands and feet aren't as well articulated as the super deformed bodies. The hands and feet don't have movable joints so their posing ability is a bit limited.
I really hope they release body variations and clothes for these guys in the future.