The exposed portion of the berg is roughly spherical. The submerged portion must be enormous and approximately symmetrical to hold that sphere in such an upright position.
So the tip of the iceberg is just the tip of the iceberg
Indeed, that tautology is a true statement.
With just one photo we can’t really say if the exposed portion is roughly spherical. However, the guy taking the photo who presumably got a better look seems to think it was “diamond shape.”