Yes, he absolutely got the idea of crucifixion, of the tension in the upper body and arms, the sense of hanging. There is nothing to improve here
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There is a wonderful story in the Archive by Elf-Bride (Elfenbraut) inspired by Drtkol's most famous crux image:
https://www.cruxforums.com/xf/resources/the-girl-with-no-name-by-elf-bride.341/
In German
This is another fine piece by the same writer:
https://www.cruxforums.com/xf/resources/mary-on-the-cross-by-elf-bride.342/