(First of all, I just want to say this 'not so good landscape' is actually really cool)
I would tell the artist to make straighter and smoother lines, because the ones on the building and the mountain to the left are curvy and uneven. Unless this was their intent, I would focus on fixing this next time. Just making everything more symmetrical because it is a bit hard finding depth in it because of this.
Answer: The type of lightning would be the Rim Light because it creates a bright line around the edge of the object, to help visually separate the object from the background.
