I think the craft is sufficiently different from a bird of prey and sufficiently similar to other Eldar craft not to be a copy.
As to ork design, what connection have GW and the makers of Warcraft? They are strikingly similar orks yet nothing like the orks of Tolkein, the orks of D&D, the orks of Runequest etc.
It is quite possible that the idea of orks as being green, with long arms and huge protruding lower jaws is an idea in the public domaine or even a standard stereotype, thus the general form would not be protectable. Though the hats are strikingly similar, just putting it in a common form of medieval hat would not be an infringement any more than putting it in a top hat would infringe Monopoly\'s trademark of Uncle Moneybanks.
In other words, both heads, while extremely similar, may be copies of something publically accessable and not protected. There is a US law suit where Ty sued a maker of a plush, bean-filled pig doll. The court ruled that the knock-off beanie babie was actually a copy of a pig and not a copy of Ty\'s plush, bean-filled pig doll.
Since orks aren\'t real, I guess we\'d have to know more about the origin of THIS particular design of an ork.