Specter/Whirlwind Characteristic....

Specter/Whirlwind is another one of this very subtle morph what iludes me and is very hard for me to determine.

So I have Request here for Specter/Whirlwind owners to point differences in appearance between Specter/Whirlwind and "wild type"
Pictures illustrating such a differences or specific characteristics will be really appreciated.

Basically I'm doing this to be able spot "possible Specter/Whirlwind" in the mob of imported babies balls and "normals" on various internet add...

So Please :please::please::please: tell me what i should looking for :D

Thanks in Advance for any response.