It depends upon where you’ll be applying for jobs. In the arts, self-expression is obviously more common and acceptable, if not expected. The more corporate you go, the more conservative. I don’t think there’s a blanket answer.

One thing you can do is check out how a company presents itself and its internal culture to the outside world. I would research a couple of potential employers and then check their websites, LinkedIn posts (and profiles of their employees for their profile photos), Twitter accounts, Glassdoor reviews, etc.