
The prisoner who is new to prison is the one sitting on the floor in the corner on the right, hugging his knees and looking extremely distressed.
Here’s why:
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The other three prisoners are calmly passing time — playing cards or lifting weights — which suggests they are already used to prison life.
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The prisoner on the right looks anxious, overwhelmed, and out of place — classic signs of someone who just arrived and hasn’t adapted yet.
So the new prisoner is the one sitting alone on the floor, looking scared and uncomfortable.