how can make 3d character to real person? (i2i, advice please)

I think Nano Banana Pro is brilliant for creating photorealistic images in T2I. But maybe because of my lack of skill, I can’t get it to look as realistic in I2I, especially for 3D-to-real conversions. I tried very short prompts like “Create a hyperrealistic photo of a woman based on the reference photo” and also very long prompts that describe every little detail of the skin (pores, vellus hair, texture, etc.). However, in both cases the results don’t look more realistic than just doing pure T2I with text only. How can I get T2I-level realism from I2I with Nano Banana Pro? Any tips on prompts, settings, or workflow for 3D-to-real would be really appreciated.

Original 3d character

:

https://preview.redd.it/qe049yvkq54g1.png?width=2500&format=png&auto=webp&s=a3be3d549ce19f29b94736f8ce94899aeffe3c18

i2i(using nano banana pro)

:

https://preview.redd.it/4znp9u9ht54g1.png?width=2752&format=png&auto=webp&s=766d0baa2cf017bed14c6a38a09a3d0d10255ef1

t2i example : (I want at least this level of realism. It would be even better if the skin detail and resolution were a bit higher)

https://preview.redd.it/j5lwox53t54g1.png?width=2752&format=png&auto=webp&s=b0bb27ca62921456841360535c3db125e27acdcd

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