When looking at his demonstration I can see some tension in the hand and forearm which is caused by a technique that isn't very economical.
First, it looks like Nikola is keeping his wrist is sort of a locked position and using the elbow for the picking motion.
I will try and demsontrate the steps to create the motion from the wrist and forearm by using a very small series of rotations. The produces a smaller pick movement that will be more accurate, and also allow the arm to relax much better.
In addition to the movement of the wrist and forearm, I will briefly talk about using your thumb and index fingers in a small circular motion to help the pick move through the string with minimal resistant.
With a little bit of practice, and focusing on reducing any tension you feel in the picking hand, I think this type of picking will become almost effortless is a rather short period of time.
Good Luck Nikola and thanks for submitting your video!
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