Americans enjoy uniformity in a way that the British don't; they wanted everybody of a sort of nice chorus line height and here I was, this person who was a good three inches taller than anyone else on the end of the line.
I look for an interesting and often times, fresh character. Something different that what is done all the time or than I've done recently. I look at who is directing. Those two variables as well as a third, which is the content and the quality of the screenplay. I look at the arcs of the scenes and

