The main thing i noticed immediately is that the spacing of the text is all weird - generally its more comfortable and more clean looking if theres a sufficient margin around the text itself, before any images or other elements start breaching the space. Try to align the text into a block as well.
I also think all of the background photos are redundant and just create a more distracting noise around the character. Imo reference sheets should be clean and simple, since youre trying to show off the design first and foremost. Trying to fit in several poses, expressions, forms, etc is just overdoing it, id say.
Id recommended looking at magazines, encyclopedias, portfolio books and character sheets from animation concept art to get a feeling for how the page could be put together.
I think the first page is the closest to a neat reference sheet, but the others have a lot of strange decisions; for example the second one has a giant empty space in the middle, seemingly 2 colour charts, a height comparison where the anthro form is the biggest even though its smaller than the human on the page itself? Tldr simplicity is key in these things id say, you can always add in more detail and pizzazz later