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Help needed - Polypaint doesn't paint high res

Hello,
I tried to search and fix this but without success.
I imported a 3274x4500 texture into spotlight, made a texture from polypaint.
And when I open it in photoshop I get a very blurry/pixelated and low res image. Why?
I tried to subdivide the model (character) until 5.4 mil polys but without success.
See pics, the polypainted texture and the original.
Thank you for helping.

Attachments

Jeans.Texture-(2).jpg

PERSO6-TM_u0_v0.jpg

Have you assigned UV’s?

yes I have a UV layout and the above image is a crop of it