It looks good, but you're supposed to use custom textures to make things look better, not worse. I suggest improving the texture's shading using dodge and burn, as well as increasing the contrast.
As for now it's good enough for a 4/5. If you improve the shading and contrast, making it look less like a cartoon, then I will raise my rating to a 5/5, depending on how good it turns out. As of now it really does look cool, but the cartoon look pulls it down.