For your item a flexible silicone mold could be made, and then a metal cast of low melting temperature Tin / Bismuth can be made in it. Multiple casts actually. Here is a link to the material - I recommend the 281-338 (check out the shrinkage data also - virtually zero)
Bismuth Alloys, Cerro Alloys
Due to the complex detail on your item, I suggest the silicone be poured in one piece around the item and then be slit with a razor knife just enough to allow the master to be removed.
Color: There are various ways of putting a patina on this metal. or it can be painted. This metal has no lead so can be safely cast and handled.