So I admit I cheated just a bit taking a picture of a sleeping individual but some of the concepts are the same. If you were taking a portrait of a person you could tell them to do a certain thing to improve the photo, unless of course you were trying to take a picture of a child. I will compare the cat to a child, were as you can't tell them to do something. You have to make the best of what they give you or trick them into doing what you want. Or in certain circumstances it is just better to take a picture while they are sleeping...that way at least that way they won't move.