ImageCollection::getFrontImage

public function getFrontImage(): ?BaseImage
{
	$picture = $this->getDetailImage();
	if (!$picture->isNew())
	{
		return $picture;
	}

	$picture = $this->getPreviewImage();
	if (!$picture->isNew())
	{
		return $picture;
	}

	/** @var BaseImage $picture */
	$picture = $this->getFirst();

	return !$picture->isNew() ? $picture : null;
}