You do not have the right to use their name and likeness on your website for commercial purposes without their consent. Civil Code 3344
You should take down their photo and bio.
Sounds to me like you need to develop a relationship with a local attorney who can advise you about your business practices. I recommend you find an attorney and pay for a couple hours of his or her time to review your business practices, web site, and employment or independent contractor documents. In my opinion, you are walking on a mine field by using peoples' photos, work product, and/or biographical information on your website UNLESS you have a SIGNED WRITTEN contract which specifically authorizes you to do so. [Including "terms" in your communications are likely to protect you.]
By the way, I have had several clients get sued for very similar occurrences. Defending a lawsuit that involves the facts you are describing can be very expensive. Better to take down the picture(s) than to get sued.
Years licensed, work experience, educationLegal community recognition
Peer endorsements, associations, awardsLegal thought leadership
Publications, speaking engagementsDiscipline