Here are some ways to improve your gameplay and graphics.
Download GWX2.0 from here
http://www.subsim.com/radioroom/showthread.php?t=102096
Also get this to improve your water and sky textures.
http://www.subsim.com/radioroom/showthread.php?t=131035
Of course its up to you, you can check out the mods section and find stuff that suites you.
GWX itself is fantastic, its 500% better than just playing the vanilla SH3.