[quote=@Avali]
If the Mark isn't required for characters, I wouldn't worry over it too much.

Grace will probably try and the hide the mark anyhow, thinking that it would be against her faith to use its power. 
[/quote]

The Mark manifests as a diamond star tattoo. It is usually found on the back of your dominant hand, but it may also be found on the waist, forehead, or nape of the neck. If the character prefers secrecy, whichever power gives it out tries to account for that.