The edge of the level is against the spinner. You can tell by how far away the reflection of the level is, from the level itself, at the lowest point of the panel, just how much further the spinner projects on the left compared to the right - 6mm.
The shape of the reflection also shows how there is more of a curve below the trim strip on the left compared to the right. This puts the trim strip on the left another 6mm further away from the spinner compared to the right, making a 12mm or nearly half an inch difference between sides, if both wings had the same profile.