My first lesson in my photography classes is one on light. I have problems taking pictures in natural light because I am normally only home after dark and my house is quite dark as well. In my current location my window is bordered up and I am only awake at night, but I know light make a huge difference. Here are two pictures of the same yarn:
The top was without flash and the bottom was with flash. The bottom one is more accurate, though it is still not the actual color. Hopefully by the end of the class, these pictures will look better.