Messing around with techniques---ceramic pottery

I had this piece laying around and decided to try the bubble technique after I had drawn the cat with black underglaze, then I put a small amount of blue underglaze in a very small container, added a bit of water and a bit of Dawn dishwashing soap, inserted a straw and proceeded to blow bubble onto the piece, after drying, I clear glazed, then fired at 04 (white earthenware clay), here is the result

I like the effect and will try it again.