WEll you asked 2 questions - the first how to save. When yo want to creaete a large image you choose the sketch design you want, then you choose to render as an animation - 1 frame the size you want and it will render the pic to disk for you. As for styles, It's kind of pick and choose fo me - I have used Ironbear's presetsat 3-D Arena, I have some there too, but I don't really do the style you are looking for - perhaps 'bears has that - haven't used it in a while. Too I always render several different lighting and sketches then I overlay them i post to get the look I want.

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