You cannot see someone's preset unless they are using the preset sync and/or downloaded the presets .fph file.
If I understand what you mean, markings work differently from presets, hence the marshmallow appearance.
Presets work differently.
Let's say you download a preset made by someone else. You install it, and go in-game to character creator.
You design you character WITHOUT the preset. Right when you put the preset on, that original design is saved underneath the preset so people withotit the sync or download see that.