PhotoWear does not have the ability to delete a photo from an album. If you were to delete a photo, there would only be a black or white space displayed.  But you can take a picture of something dark or light and replace the photo in the album with it.

 

If you're looking to have PhotoWear auto-advance through a subset of pictures in your album, you could accomplish this by uploading the same picture(s) multiple times in the same album.