Tiny Pictures, the company behind cameraphone photo-sharing service Radar, announced it has secured $7.2 million in Series B funding. The investment was led by Draper Fisher Jurvetson, and included Series A investors Mohr Davidow Ventures.

Tiny Pictures had previously raised $4 million in first round financing, the company said this second round will allow it to focus on international growth opportunities, as well as further develop its ad platform.

Tiny Pictures says that Radar is the largest service of its kind, serving more than 15 million pictures per month to mobile users in all regions of the world; partners include T-Mobile Germany, Bell Mobility, Danger and Research In Motion.

“In Radar we’re building a globally relevant and deeply engaging service that transforms the way consumers share experiences with friends,” said John Poisson, founder and CEO of Tiny Pictures, in a statement. “Both Draper Fisher Jurvetson and Mohr Davidow Ventures share our vision for the future of mobile, and they bring a wealth of expertise to the table. We couldn’t ask for better partners.”

Tiny Pictures recently launched Radar Gallery, which offers sponsored content alongside personal content. Recently featured content included promotions for the 20th Century Fox film “Hitman” and the Warner Brothers film “I Am Legend.” This month, Black Eyed Peas frontman will.i.am joined Tiny Pictures’ Advisory Board, and will collaborate with the company to launch Radar Gallery promotions for his projects.