Why is it that the fox I trained with run.py are not clear and their eyes are not visible

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python scripts/run.py --scene data/nerf/fox/ --save_mesh data/nerf/fox/fox.obj --screenshot_dir data/nerf/fox/save/ --train

I do not use the graphical interface in Linux, so I cannot see the change process of the model, but the loss has been reduced to 0.000271, but the fox is still very unclear, may I ask what is the problem or what parameters are missing