Santini was a sculptor born in Florence, Italy 1910 and studied under Colombini, he died in 1975 the businessm is still going and run by his family.
The sculptures are reproduced from the original designs, a compound of alabaster, carrera marble and resin are poured into moulds to create the sculptures.
The majority of the sculptures made are usually classical in design, with either a religious or mythological theme. The western sculptures are more popular, some are painted, and some are rare and so worth a lot more.
Valueing these sculptures could be a difficult thing, for insurance I would value them high because replacing them would not be that easy. You can pay for to have them valued but try local auction house first, they will usually do this for free although be aware that they would be valueing them at 'auction' prices.
They are great sculptures and if you did intend to sell them I am sure they would get best prices especially if you sell them in the right place. Ebays always a good start but be sure to include good photo's, a good description and most of all, start the auction at your best price to begin with.
On the right day and at the right starting price I am sure they would sell and to the right buyer.