Head Study: Roman Bust

I had a lot of fun nudging the base mesh I used as a foundation into the bust's likeness. I felt pretty accomplished once that likeness began to shine through. One of the biggest challenges I has was in sculpting the beard. I made the hair, beard, and mustache sperate from the head. I think I made the beard and mustache a little too thin as carving into them while sculpting would sometimes cause them to pass through the head. This made it difficult to go deep on the beard. That said, I think going deeper on the beard would the first thing I would touch up if I revisit this.
The reference I used is from https://www.metmuseum.org/art/collection/search/256911?searchField=All&sortBy=Relevance&ft=bust&offset=180&rpp=20&pos=199.