@Puybaret:
I tried again with PNG and transparency as you said: the problem occurs only in 3DView, in the rendered snapshot all looks good. :-)

This is the result:
http://www.imagesup.net/?di=1614014521093


@bitacovir:
Thanks for the link, but I'm not interested to create the statues one by one ...

Yes, they don't look like the original statues, but at the moment are enough to give an idea. (maybe a funny idea!)

I've already tried this way (my first and only option) but the transparent portion of the texture turns black in 3DView.

based on "Pietrangeli" court of the Foro Italico in Rome.

http://www.imagesup.net/?di=1140136843315

http://www.imagesup.net/?di=114013684337

http://www.imagesup.net/?di=014013684342

I'm a newbie with sh3d and this is one of my first projects. What do you think about? And... how can I ...