Artistic interpretation and expression aside, if you tell me it's Abraham Lincoln, or it's Naploeon, or it's Erwin Rommel and if it does not look like Lincoln, Napoleon, or Rommel to me, I will not be purchasing the bust.
:unsure:
Most of what you want to do is not likely to be too visible in 54mm. I would not make the attempt to show sweat on his face. The act of mopping his brow with his handkerchief will tell viewers what he's doing.
Show where he has sweated through his uniform.
:)