Hey Rodrigo, here with a quick pre-promo cleanout! You have a pretty well curated gallery already - the number of graphics you have is great.
I'd take out the first and last banners (poor image quality, and the different first M in moments, for the first, and weak composition and text on the last). The second sig isn't as good as the others - I love the coloring except on the smaller model, and the text is hard to read and placement is awkward. Chapter images and icons are I think your weakest sections - I think you're capable of doing better than the graphics you have in there, honestly. Same with the blends- having only one is fine, but I think you could make better use of the space.
In general, watch out for overfiltering/poor image quality, cohesive composition, and make sure the text effects aren't actually making the text harder to read. Hope this helps, and feel free to pm if you have any questions!