the shape of this mug is very nice/classic. the handle seems a little too big though as it unbalances the form. what if you made a 1-finger (or 2) handle that started from the lip and went to the protruding shoulder?
interesting glaze. much more flashy than your other pots. the harsh corners on the rim i think doesn't make sense. and the lines in the inside of the bowl are hard to understand as well, at least without another picture of the inside.