Ouch, downsizing those textures seems to have hurt it pretty badly. Seeing as the textures were intended for source and have very little painted lighting, they overall look really blurry and flat.
I've no idea how the UV layout on this model is, but perhaps it'd be possible to cut down the textures of this model onto multiple 512s? You'd get a much better result with the textures, and even more so if you painted some lighting back onto the textures to make up for the lack of definition.
Also, are you running 'gl-max-size 512' in your config.cfg? (the - should be _ there, but dumb post formatting won't let me) By default it's 256 which resizes all textures ingame to smaller size, and since lots of custom stuff for GoldSrc CS uses 512s you might be missing out.