I am not sure myself of how much interlace is too much and so. I think it's useful for showing rough texture... I wouldn't use it on metal a lot unless I wanted rust and such, and I'd always offset it with nondithered bodies of color. I like the piece, but what I feel it suffers from is lack of volumetric distinction. It's too blobish. Where are the corners? Sharper, defined edges and flats is what you need I think.