There should be more flexibility - like having English on the front and Japanese on the back and being able to put pictures on the back etc. Also, why not have the (option) to have the audio play automatically when the side shows?
The pictures are great but the way the default setting is setup, I know I will remember the English based entirely on the picture without learning the Japanese. The pictures are so intuitively obvious that I don't even need to flip the card the 1st time to get the answer right a lot - without knowing the Japanese.