The BRC Breed Standard specification sets out the following attributes required for a Rabbit to be declared as a German Lop.
The hind legs should lie parallel to the rump and not jutting out when resting.
The German Lop should have a Roman nose appearance with well-developed cheeks.
Ears - The ears should be broad, thick and of good substance, they rise from a strong ridge called the crown on top of the head, carried closely to the cheeks, with the openings turned inwards.
The ears should hang down straight just behind the eyes without either being carried forwards or backwards.