As I've said before, just having a license or certification doesn't mean a thing.
One thing that I'm really concerned about is the green insulated wire connected at the top of the left hand neutral/ground bus. Please tell me that this is not the equipment ground of a feeder supplying this panel. I know that if it is you'll disconnect the metal bar that connects both busbars together and get the noodles connected in the right place.
At least he didn't throw away the bonding screw.
Few things are harder to put up with than the annoyance of a good example.