Ok, there is one thing you really need to fix -- the GIGANTIC picture textures.
A) There's no way they need to be THAT big.
B) The large version should be in the HR4 directory, and there should be a 1/4 resolution in the regular texture directory.
C) All texture sizes should be powers of 2 (64, 128, 256, 512, 1024), otherwise they'll get scaled and reduce the quality, increase load times, and increase memory usage.
D) Why are they all grainy/low definition?
Fix all the texture sizes, THEN you can call it final.