I agree that the art in this story is only so-so, but you shouldn't judge all of The Phantom by this sample. There are many artists who've done great work on the series, and some of it is fantastic. (Since the magazine is a bi-weekly in Scandinavia, and has been running for nearly 60 years, there's an enormous library of stories to draw on.)
The Phantom is originally an American newspaper character, and all of Lee Falk's stories must have been written in English, but it seems like apart from the early newspaper strips, not a lot of it has been reprinted here. (As opposed to in Europe, where all the classics are afforded deluxe hardcover editions.) The Moonstone books apparently don't follow the newspaper strip/European continuity.