Yupar, so lovley and good looking, it will be a hard wait for the final result!
A few personal remarks, that I think increases realism and adds to the 'wow' factor. A more greyish tone on the wood of the cross and small blocks of wood around the nails would in my view be an improvement. I also think that some kind of support always were used, either a small block of wood for the feet to rest on, or some kind of a cornu.
I dont know which type of cross you are going to hang on, if it will be a pre mounted 'T', or if it will be platibum that is assembeled or raised at the execution site.
It would be perfect if you in the image can pay attention to how the intersection between the cross pices are done. Perhaps some rope that holds the parts of the cross together.
Anyhow, this is so beutiful and will be / is already great in any case. Wish it would be possible to be at the execution site, and watch your crucifixion!
Thanks a lot for all work!