When I was a wage-slave and managing people, I always tried very hard not to 'judge the book by its cover', and I wouldn't have been put off employing office-bound staff by their having proper, professionally-done, tasteful tattoos in appropriate places. However, home-made dots and acronyms on knuckles, spiders' webs on necks, stick-men on hands etc., are taboo, AFAIC, and would definitely have been a major black mark against an applicant who displayed them.

I didn't do the setting-on of customer-facing staff, but I guess I would have had to make a judgement in that kind of circumstance, and I suspect my judgment would pretty much align with Musket's. Fortunately, I'm retired now, so it ain't gonna happen! :-)

My wife and I both have tattoos, and they were done by a very skilled, highly professional artist, but they are in easily-covered locations, and no-one sees them unless we choose to show them.