It all depends on what kind of files you are installing. Where things are supposed to go depends on the file extension. Clothes are cr2 files, and should go in the Characters sub-folder in the folder Libraries. Clothes usually has an obj-file as well, which belongs in the Geometries folder. If files relating to eye textures end up in the Poses folder, it's probably MAT-files, files that loads the corresponding texture to the figure. This is normal. No files related to eyes should be in the Faces section, this section is just for files that applies face poses. You can to some degree move folders between sections, but you need to change the file extension, otherwise the files will be invisible in Poser. If you move files from the Pose section to the Face section you need to change the file extension from .pz2 to .fc2. Pose, Face, Hand and Camera files are logically the same type of files, so theoretically they can be placed in any of these folders, as long as you change the file extension to the one that Poser will recognize as belonging to that section.