i agree Frost. i mean it is their first photoshoot. so you know how top model has to explain it to the girls. Like how she says "i only have 13 photos in my hand. And these represent the 13 girls that will advance with the hope of becoming America's Next Top Model. And the prizes are.... and the judges are...."
So i just think he is telling them to do their best because by the end of the episode (which he uses a description that can go anyway) one will go