First off. Some people are calling this a horror movie. It is not. This is a mysterious drama-thriller with supernatural elements, and just the slightest hint of horror. Now, I expected this so it was OK, but be aware. Expectations is a movie worst enemy!
OK! So Thelma is beautifully shot. Thought has gone into each scene, and each camera angle. The movie overall is very calm, kinda quiet. Eili Harboe is excellent as the titular character. The other characters are good too, but she stands out. She has a very natural way of acting. Also she is beautiful, and so is Kaya Wilkins, which plays her new friend. Gorgeous people.
Like I said, Thelma is a calm, low key movie for the most part. I did think it dragged just a tad in the middle part, but both the beginning and ending is pretty good. It has certain romantic tendencies, but it was done in a not annoying way. Good.
The are some scenes with CGI here, and they are very well done. You almost won't notice they are CG, except from the fact that you know you are watching something impossible. That's good. Thelma is not heavy on big effect stuff, but the effects that are, are excellent.
Joachim Trier is Norwegian movie critics golden child. They love him over here. Personally I'm no big fan, but then again, Reprise is the only movie of his I've seen, so I can't really say. But Thelma is the kind of supernatural movie movie critics are actually allowed to like. Because it's kinda artsy, ya'll! ;) Anyway, I liked it, didn't love it, but maybe I will later? I doubt it, but who knows! Know what you are in for, and you will probably like it too!