--Are the Hidden Color Cards double-sided? I recommend against it, as seeing various combinations on the back may be confusing for new players, or extra information to experienced players.
--I recommend a picture of the board explaining what a "space" is. It's not entirely clear that each anatomic structure can have 2-3 spaces.
--If you want to be especially fancy, consider making custom dice that have a blue background on the 1 and 2 sides, pink on the 3 and 4 sides, and green on the 5 and 6 sides. This makes it easier to see what colors you can choose to query.