A group of judges for a modeling competition are having a hard time picking a nice photo of a model and one judge says, "There's no life in your eyes."

What does that mean?

Not sure I understand your scenario. Are the models present, or only the judges and the photos?

I think looking into someone's eyes is a fairly universal experience - as is life. How about "liveliness"?
Yes, the model is present. The judge is telling the model while looking at her photos.
Students: We have free audio pronunciation exercises.
An ANTM fan eh?

They mean that the model's eyes are expressionless - they want to see some emotion/meaning in them.
It's a good show Emotion: smile

You might also say 'There's no animation . . '

Best wishes, Clive
Students: Are you brave enough to let our tutors analyse your pronunciation?
Make sure the "expression and emotion" are not sadness and dispair.