Find at least one detail you enjoy... is like think of a compliment to give an ugly person you don't like. Why??? Do they need your approval? If someone is confident about their art they don't need a fake compliment. If they lack confidence an insincere compliment will not help them!! A thoughtful question would show much more interest and respect, like how did you get that idea? why did you choose that medium? that subject matter? what inspired you? how did you decide to do that? where did you learn to do that? how did you become an artist? how did you set aside time to work on that? Any question sounds more intelligent than a fake compliment. Bear in mind, I am not suggesting insulting questions like: what is that supposed to be? how much time did you waste on that? who would ever buy that?