Difference between "human" and "humanized"?

For example, Somnambula or Sour Sweet drawn as a human would get the ‘human’ tag… but I’ve seen comments that say it should be ‘humanized’ instead. Is there a difference?

Yes - ‘human’ is exactly what it says on the tin, but ‘humanized’ is for characters that are originally not human (‘equestria girls’ does not count as human for threse purposes) being drawn as human. All ‘humanized’ counts as ‘human’, but not all ‘human’ counts as ‘humanized’.