One detail that has received little notice is Aleena's red, left upper extremity. This is actually a demonskin tattoo that provides magical protection against elemental attacks. It may seem inappropriate for such a character, but it served Aleena well over the course of her long career as she battled the demons of the Elemental Chaos.
Regarding the size of Aleena's balls (there's a funny in there somewhere), I think we may get accustomed to seeing depictions of oversized weapons in art. At a glance, they seem kind of small to me too; but when I think about the one flail/morning star that I have seen in real life, the size is just about right.