Colour and design are used the most when shooting almost any type photography.
A good foundation in art history would be a great addition. As artists learned better to both see the world around them and developed techniques to better illustrate what the saw, the images became more complex in nature including foreshortening, perspective and use of light more effectively. These are all important elements in any art, including photography.
It is in the pursuit of a degree in art, that one learns the importance of knowing the technical use of their chosen medium as well as the creative seeing. The balance of technique and creativity is perhaps the most difficult lesson to learn ... we tend to want results NOW
