According to Official Guinness Records,
The largest make-up painting measures 56m² (608 sq ft) and was created by Mary Kay Inc. (USA) in Dallas, Texas, USA, on 6 August 2013. The mural measures 76 feet long by 8 feet high, and was created entirely out of Mary Kay make-up in honor of the 50th anniversary of the company's founding. Artists from Eyecon Studios spent two and a half weeks painting the mural using only make-up brushes and sponges.
For a complete list of 2013 records, please visit 2013 Guinness Records in United States.