In multiplayer it will be okay, But not in single player!  

"They mean that a zabrak's natural skin colors are more or less human colors, Maul included.  Maul had a full head(body?) tattoo of red and black done to make his appearance that much more menacing.  So before the tattoo, Maul's natural skin color would have been more like the one in the screenshot.  It also explains the lack of hair, I would think. "

The tattoo is not to make he look more menacing it is a Sith power tattoo. The guy in Star Wars:KotOR has some to just not like Maul's

Rodain, Zabrak, Twi'lek, Kel Dor, abd Human. they are all the species in the game now.

ones i would put in
Quarren
Mon Calemari
Ho'Din
Gran (people with heads that look like a cow but have 3 eyes)
Falleen
Davaronian (look like devils)
Bothan
Arkanian
Aqualish
Gungan
Ithorian
Firrerreo
and whatever Desorvn is

I would have liked Cathar or Nikto

Cathar is the feline race from the Dark Horse comic series Tales of the Jedi.
And i dont mean the incorrect looking version in the game KOTOR.