Bounteous Mother Nature continually produces new versions of the genetically blessed creatures we idealize so intensely we call them models. They exist in every place and every population. The challenge is hunting them down. “I never thought about modeling in my life,” said Mohamed Ali Ibrahim, 18, who appeared in a show for the label Head of State on Monday in New York. Mr. Ibrahim immigrated to Albany three years ago from Sudan. He was spotted by Head of State’s Nigeria-born designer, Taofeek Abijako, another Albany resident, at his high school prom.