Anyone know anything about mould making?

I've been doing a series of sculpts of D&D characters and one in particular I made with no intention of it ever being cast. It looks like I may need to now. I can see I'll have to amend the horns at the very least. Any idea if I did a silicone mould if this would hold up?

https://imgur.com/a/AhfW1

from what I can see from your pics you have a lot of undercuts that you would need to fill in that will lock the piece into the silicone if you are going to make a mold. areas like the lacing. it looks like they are just laid on there (floating). but if you make a silicone mold unless you make a very complicated matrix mold, it won't work. areas that are "floating" like the lace will lock the clay into the mold and will tear the silicone when you try to pull a casting.