The translated article provides some backing to the claim that it's a face in a style that matches other finds in the area:
"The arm and hand reliefs on the T-shaped standing stones found in Göbeklitepe and its surroundings have long strengthened the idea that these stones symbolize humans. This new find, which was unearthed in Karahantepe, is described as a new turning point in Neolithic period research with the fact that the human face was carved on a T-shaped standing stone for the first time."
"With its sharp lines, deep eye sockets and blunt nose, it carries a style similar to the human statues found before in Karahantepe."
"The arm and hand reliefs on the T-shaped standing stones found in Göbeklitepe and its surroundings have long strengthened the idea that these stones symbolize humans. This new find, which was unearthed in Karahantepe, is described as a new turning point in Neolithic period research with the fact that the human face was carved on a T-shaped standing stone for the first time."
"With its sharp lines, deep eye sockets and blunt nose, it carries a style similar to the human statues found before in Karahantepe."