For many individuals, a Scottish ancestor's profile should feature the "family coat of arms". I am sorry to have to inform you all that under Scots Law there is no such thing as a "family coat of arms". A coat of arms is the personal property of 1 person, either the person to whom it was originally granted or his/her direct lawful descendants, one after another. Even Prince Charles is not entitled to display his mother's coat of arms until she dies and he inherits it. Prince William would then inherit his father's arms as Prince of Wales etc. Each member of the Royal Family has his or her individual coat of arms.
I have been working on profiles for members of Clan Munro in recent days and noted that a set of arms which I understand is popular among members of a group of Munroe families in the USA appeared on the profiles for the line of Munro clan chiefs and their immediate family members. I have now removed these as they are strictly an illegal use. There is nothing to prevent members of these Munroe families in the USA displaying them on their own profiles since they are not governed by Scots Law though I would indicate that they have no validity, no matter how attractive.
Members of any Scottish clan who wish to display emblems which demonstrate their natural pride in belonging to a particular clan or having an ancestor who was a clan member, should display an image of the clan badge sometimes called a crest. This is perfectly legal and very welcome.
I will be happy to offer any guidance to any member of Wikitree on what is and is not appropriate to display in relation to the profiles for Scots or Scottish ancestors because obviously I want to encourage pride in having Scots ancestry.
Where you have an ancestor who belonged to a Scottish clan it is also appropriate to display the clan tartan strip for that clan. If it is a married woman, it is entirely appropriate to display both the tartan of her clan by birth and if different, her husband's clan. Even if you do not have the principal name of any clan, if you profess descent from a clan or hold membership of any clan society, either in Scotland or a daughter society elsewhere around the world, I would hope you would choose to display the clan strip on your profile to show that pride.