Hi @julstamban,
This post is in violation of the rules of posting in OCA.
No Copies/Studies of other artists drawings/paintings.
In other words, drawings of drawings are not allowed. This is just a rule in OCA and you should be able to post this in other communities without issue, but please read the pinned rules posts and be mindful of them as repeatedly breaking the rules will result in your account being muted in OCA.