hey i am fine with it not looking humanoid, but at leats make them look acceptebly intimidating, not from a kid's tv show.
https://www.google.nl/search?q=fallout+zetans&tbm=isch&source=iu&ictx=1&fir=Yy242G9AYyDWlM%3A%2Chi87PuKbW7MFOM%2C_&usg=AFrqEzdXUYxUIU2XlKnYohwe_3cmlzXt3Q&sa=X&ved=2ahUKEwishvPM-9jcAhUPEVAKHb_CB6QQ9QEwA3oECAQQBA#imgrc=Yy242G9AYyDWlM:
see here, a zetan. an alien just like ours, exept this one didn't hide a balloon under his shirt to make him look strong
the same cute-ness is going on with the sebilian imo. un-de-evolve the tail and add back some spikes and it look like an evil mean monster again, now atm its tail looks like its from a poodle and the sebilian is an infant
another issue i actually take is that they look really short, im not saying they are short, they look short. in the way someone can look really short but still actually be taller than you, short