"Her personality was very complex, but yet she had a charming, sexy and seductive side that reminded me so much of Anita Ekberg from Frederico Fellini¹s film 'La Dolce Vita,'" he said.
"In the fall of 1992, we went on tour with Anna Nicole to the Guess store openings in Hong Kong, Jakarta, Tokyo and Singapore," he added. "Thousands of people showed up at every single opening. It was simply overwhelming to see such a large crowd for a model who had just launched her career in the Guess campaign six months prior.
"I did two more campaigns with Anna Nicole before her personal life took precedence over her career," Marciano wrote.
After her Guess campaigns, Smith appeared numerous times as a Playboy playmate -- and Hugh Hefner, the magazine's founder was among the first to send out a press statement on her death.
"I am very saddened to learn about Anna Nicole's passing," Hefner said. "She was a dear friend who meant a great deal to the Playboy family and to me personally. My thoughts and prayers are with her friends and loved ones during this difficult time."
Darren Prince, Smith's former agent, called his former client "a sweetheart."
"I have done a number of major deals with her and Howard [K. Stern -- Smith's lawyer, whom she reportedly married] in the past and she was simply a pleasure to be around," Prince said in a statement. "My heart goes out to Howard and her family during this troubled time. … I will pray for her family."
In her later days, as Smith's weight publicly fluctuated, she had yet another comeback as a spokeswoman for TrimSpa, a weight-loss company.
"Anna came to our company as a customer, but she departs it as a friend," said Alex Goen, CEO and founder of TrimSpa, in a statement. "While life for Anna Nicole was not easy these past few months, she held dear her husband, Howard K. Stern, her daughter, Dannielynn Hope, her most cherished friends, beloved dogs and, finally, her work with TrimSpa.
"Anna knew both the joy of giving life, and the heartache of losing a child," Goen added. "We pray that she is granted the peace that eluded her more recent days on earth, and that she find comfort in the presence of her son, Daniel."
ABC News' Michael S. James contributed to this report.