Thank you very much!
First of all, I got a better resolution and then I managed to make the image better. It seems to the that the image size I export from the Preview is restricted by the Render Dimentions as well.

After all efforts I discovered that Comic style actually renders too!  For some reason when I tried to render it before, it switched to full textures.

Now I am very happy, the style is so oldschool and powerful, just like the character. ))

The only concern is that hair grown in the Hair Room doesn't show well enough in Comic Book style, also when I render it.