I was in a relationship with a tattoo artist for 4 years, so I got to know many of his friends who were mostly tattoo artists as well. All of them were responsible tattoo artists, looking like thugs, but realistically they're business men.
All of them are hesitant to tattoo someone on the neck, face, or scalp because once that ink is in the skin, it's there for life. The person with that visible tattoo can be stereotyped by others, and that tattoo can become a huge roadblock in that persons life.
The client can easily come to regret their decision for getting such a visible tattoo. So, for most artists, they won't tattoo the head area on a tattoo virgin.