To be honest I think the best solution would asking player about what is preferred: static artistic portrait or based on model portrait.
I personally use artistic ones sometimes, but in most cases nothing just matches. So ones based on model work for me most times as I'm not the person (I just like to use what was given) to look around the net or mods to find something I like and maybe will match my character. But I understand that some people would prefer artistic ones as they have own charm.
Also one Easter egg I would find cool to implement is visible damage and some effects like curse for model based (current ones) portrait in the bottom middle. Something like in classic Doom or Wolfenstein, but with current graphics and possibilities.
