@yozhikisblue Oh yeah!! Definitely, there are common areas and poses. I mean art is so saturated that someone somewhere must have thought about your idea before. I have dumped to the trash some drawings that I made 8 years ago that now resemble a popular manga covers...I made them first but people will accuse me of stealing from a popular artist. Honestly, I give people the benefit of the doubt when they are accused of stealing because accidental similarities happen.
Also, we can't ignore that trends exist. Like in the 90's posters in which all characters were distributed in a V. Shojo manga has pastels and flowers randomly flying around. Sometimes the line is blurred. This mangaka in the example got caught because she stole covers from the same artists all the time. Clamp is pretty famous but if she had copied from smaller publications people wouldn't have noticed. Also, Clamp published those before the others ..yes we can say they own that composition.
But usually, art thieves get caught because they do it constantly.
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- Their art is a carbon copy that is impossible to ignore. For example the cover with the girl and the flowers. The image is traced from the original cover. We might find lots of covers that have the same idea. But is incredibly unlikely two people make the exact same.

Exactly @BobbyjoeXforgotensb you clearly made a tribute cover inspired in a music album but I don't think some would ever say is a copy.