Beautiful still. I like the colors and the cup looks great. A friend of mine is working with ceramic art too. If you or your wife are interested, have a look here at some samples of his work.
Judging by this, your wife is a fantastic artist! A lovely 湯飲み wonderfully photographed. If I ever make it to Hokkaido, I'll have to drop by and try to convince your wife to sell me a few cups!