Very nice introduction and welcome to the forum. The detail work on this sculpt is pretty impressive. If you are okay with constructive criticism, then perhaps the jaw and lower part of the face from under the nose tip is a tiny bit too extreme for the rest of the sculpt. As if it doesn't really fit in, a bit too large. However, if the style is to make a bit of a caricature of Arnold, then I'd say you hit it out of the ballpark with this one.
Still amazed by the level of detail on this piece.
Good luck.