Emily & all, my daughter also has a crystal ball and she has very good luck with hers. she uses hers more than i do mine though. she did as LittleBuddha mentioned, started out only scrying 10 minutes at a time, as after that she would get tired and a headache. now though, she seems to get 'lost' in it spending many minutes scrying and she sees many things.
just before she began to see images, she could see the clouds forming, as you mentioned, emily. this encouraged her and she kept with it, so Emily, if you are seeing clouds, just stick with it for awhile. When she first began to see images, she did not know how or what to make of them until I mentioned looking the images up in dream book. tehn it all began to make sense to her. now she is seeing lots of things with people she knows in it, both living and deceased. she says it is like a mini movie or television show. sometimes it is still hard for her to decipher all that she sees, but she also gets a gut feeling with the meanings or symbols along with the 'pictures' of the people. these symbols she still looks up in a dream book, and then all begins to make sense.
i guess the ball is what is good for her, and as much as i wish i could use the ball too, i am more drawn to teh cards. she also has tarot cards, but is more drawn to the ball. to each their own, but i will still occaisionally draw out my ball to try.