>>9433582your best bet is mixing greenstuff with miliput or ideally apoxie sculpt.
Miliput is pretty terrible for sculpting on its own.
greenstuff is pretty difficult to start learning to sculpt.
>>9426524really not worth it to use apoxy putty for casting parts unless they are small.
to both, id recommend using super sculpey firm it can get good detail and is very easy to sculpt with. make a sculpting handle like
https://www.youtube.com/watch?v=Mrkgviqn29Uand stick a wire armature into the handle, cover the armature in greenstuff, then before it cures coat the greenstuff in a layer of super sculpey.
you can get away with a blue stuff mold but you might as well just do resin casting with silicone.
i had struggled hard learning to sculpt until i starting using this method. the handle is a life saver.