Blurry Mask Effect

Hello friends,

I wonder why my mask turns blurry when rendered from stager, even in painter is already looking blurry. I cant seem to figure it out. Please let me know if there is anything I can do to get a sharp effect like the one shown on the sign on the top left. Only the signs at the bottom and the right look blurry. 

I have includded the image im using to mask the bronze material and height layer.