Its head is long, and a little more swept back than the average Xenomorph. Most people believe that a commander xeno is a drone or warrior that earned its commander position. They are also common around queens and are slightly superior to warriors in every way.
In the 2010 Aliens vs. Predator game, it is possible that Specimen 6 may have been a Warrior Commander. However, there is no canon evidence on this theory, neither supporting nor denying it.