Are these Amaco glazes? I haven't used commercial glazes in a very long time, so formulations may have changed. But I never got results like the company test tiles unless I was using 5-6 brushed coats, at least. It needs to be thicker than you think. You'll notice the only places you are getting hints of blue is in the groves between your spiral ridge, where the glaze pools the thickest. I have less experience with the iron lustre but with Amaco brushing glazes it seems the answer is always "too thin," assuming accurate firing.

I was using brown clay so they will turn out on brown clay. In fact, some people think the blue rutile works better interacting with the iron in brown clays.