I would like to see the option to adjust the size of the thumbnails in a Photo section of the library and also have the option to view photo thumbnails as a collage where vertical and horizontal photos are next to each other, with a think black space separating them – something akin to SmugMug or Flickr. A very nice addition to thumbnail and collage viewing would be an infinite scroll feature where more photos would dynamically load as you scroll further down the page, up to the maximum photo count we set for all albums or each album individually.
When viewing photos individually, an option to show small thumbnails underneath, above, or to these of the larger photo would be a nice navigational touch for jumping around the album.