I sent an invoice for services that were rendered already and it has not been paid after 30 days. I will try and contact the owner one more time, if it does not work I would like to file a lien.
Yes, you are entitled to a lien for the monies owed to you if there is a contract.
Fla. Stat. 713.03 state that any interior designer with a direct contract (contract between you and the property owner) has a lien upon the property the money owing to them for their professional services, regardless of whether such real property is actually improved.