There are 8 Statuettes to find around the Villa in Monteriggioni, they aren't very hard to find providing you use
Eagle Vision by Holding , the statuettes will then glow white when you see them.
You only need to walk over a Statuette to pick it up.
Note: There are 4 plinths around the back of the Villa where you can place 2 Statuettes, doing so gets you 2000 Florins so I suggest you do that to gain a free 8000 Florins, also adds to your Strongholds total value for Podestà of Monteriggioni in Assassin's Creed II (PS3).
Here is a map with the location of all 8 Statuettes along with a video that goes in order of the numbers on the map.