Thank you for your question. Sorry to hear that your expectations were...violated.
A couple of questions and legal facts for you to know.
1. Getting a W-2 instead of a 1099? Well, the first thing is that a person's paystubs will show whether they are having payroll taxes deducted. If a $20/hour worker is getting $800 net for a 40-hour week, then they KNOW that nothing is being deducted and self-employment taxes will be due. However, the IRS has a large list of factors it uses to determine whether a worker is REALLY an independent contractor. You can read them here: general rules-- https://www.irs.gov/Businesses/Small-Businesses-&-Self-Employed/Independent-Contractor-Defined
A bit more detail- https://www.irs.gov/Businesses/Small-Businesses-&-Self-Employed/Independent-Contractor-Self-Employed-or-Employee
Specific factors- https://www.irs.gov/pub/irs-pdf/fss8.pdf
Look at Part II of that IRS pdf document.
I can't give you legal advice here, but many people can read the rules and the definitions and the forms and come to their own conclusions.
2. Use of a person's likeness for profit:
This can be sticky. If the promotional materials are intended to bring more customers to the business and that increased business volume includes the worker getting a piece of that pie, consent for such use is often implied AND will result in no monetary damages to support any sort of a lawsuit.
Consent given can be revoked. If a signed release was NOT obtained first, any verbal consent or implied consent can still be revoked, traditionally and most reliably in writing. Unfortunately, a lot of bona fide employees never revoke consent for fear of offending the boss, being subject to retaliatory actions, or even losing the job. IF a person really is an independent contractor, the "harm" is supposed to be much less if they lose the gig, because being self-employed is supposed to mean that the person can just generate more business somewhere else with another independent contract.
You can find a very nice write-up on Florida's law governing use of a person's name or likeness here: http://www.dmlp.org/legal-guide/florida-right-publicity-law