Greetings from lovely, frosty Canada Eh ...
I've been working with SweetFX & several of my games lately
and am happy to say that SH3 is far & away the most dramatic
example of how much you can improve an old classics appearance.
This is all you need to get SweetFX up and running ...
http://reshade.me/sweetfx
This is all you need to get started customising SweetFX' settings ...
http://sweetfx.thelazy.net/?p=91
Here are some rather dramatic screenies that I took,
Demonstrating what can be done with a basic clean install + GWX Mod.
( Vanilla / SweetFX )
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