Avoid being pseudohuman.
That means you shouldn't call yourselves a separate race if you're really just
humans with special powers, minor cosmetic changes (ears, etc), or an extra organ or two. This alone may be grounds for the denial of a submission because the setting already has more than enough pseudohuman species.
If you can't easily interchange the word “alien” with “creature” consider upping the strangeness.
We already have way more types of
humans than we need.
SOURCE:
https://wiki.stararmy.com/doku.php?id=guide:creating_a_species#cliches_to_avoid