That was what the main thing I had in mind while building this, avoiding any gaps as much as possible. There was a lot of trial and error involved, but I never worked at this scale before; most of it involved trying to get the proportions right-ish.
I wanted to make the mouth in the style of the busts I've done, but this is a tad bigger and I couldn't figure out a way. I had the same mustache thought in mind, but couldn't come up with something better.
Planning to do more of these in the future, hopefully I'll manage to refine the frame and improve proportions eventually.