Harmony has clear belly.
My original Harlequin Female has "black lines" on both sides of the belly. But not complete.
The Offspring Harlequins also got this marker but not as extreme as mom.

Btw i also got a Harlequin YB here. Hes great. Nices Yellow colours i have seen on an 2 Year Old YB so far.

Will post pics soon

Best wishes, Sito