It appears that at least the first two drawings are copied sketches of the work that Hive account@hivewatchers linked. While there are some in the community that consider such 'copy-sketching' to be derivative, most of us will not downvote as long as you provide attribution to the original artist that you copied.

In this case, no such attribution is provided, so you are implying that the work is entirely your own. Lack of attribution means that your post is plagiarism.

none of these drawings have a particular story

this would have been the perfect place to add a 'but I was copying this famous artist to improve my sketchwork'.