How to improve the graphics

[g0ldust]

The game runs smoothly, but the quality of the image is poor. How do I make it look better? It seems quite blurry, and I know ps2 graphics weren't great but I don't remember it looking this bad

[jesalvein]

Increase internal res, and use FXAA.
but keep in mind it will need a good GPU

[Brock lessner]

Set 2x or 3x native resolution . Enable shade boost put all three sliders to 60%.

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Sorry jesalvein didnt see your post.

[mr_bigmouth_502]

Myself, I just disable texture filtering and put a different resolution. For 4:3 games I use 1024x768, for 16:9 games or 4:3 games with 16:9 hacks I use 1024x600. Some games I've noticed will actually take advantage of higher resolutions than the PS2's native resolution, such as Odin Sphere.

[Nexxxus]

use post processing shaders.
SweetFX or this GSdx Shader makes the image look more eyecandy.