I'm a librarian who loves anime, manga, and reading a wide variety of genres.
Again, I'm guessing at the page number, but I can say that all three of these images are from the same issue, #5, so I know they were all done by the same pair of artists. Here are three panels with the Zygos Twins:
This one's pretty consistent with how they've looked throughout the book.
And here's a panel from a few pages later:
Apparently the artists suddenly decided that the female twin's femaleness needed to be highlighted more and gave her prominent lips and noticeably darker and thicker eyelashes.
And here is a panel a bit later on the very same page:
What in the hell?? The female twin no longer even looks like the same character.
So basically, one of the problems I have with this graphic novel is the artwork. I feel like character appearance shouldn't vary this much in a single issue.