We recommend a maximum of 40 images. The ideal number of images for in an album is 10-20.
The first reason for this recommendation is that albums with fewer than 40 images are shared more frequently than albums with more images.
Additionally, a key feature of StickyAlbums is that albums can cache to a device for offline viewing. Phones typically cache between 40MB and 50MB of data. If you place too many images in your album, it may no longer cache for offline viewing.
Note: The New StickyAlbums will not let you enable offline viewing when you have more than 40-50 images total in your StickyAlbum.