Cloud + rain - sunshine = poor photos!!

Trying to take photos of projects at this time of the year I always find difficult. I don't have a fancy camera just a bog standard digital one, but today out came the hand book and I had a little play moving away from the Auto mode, changing lighting, ISO speed etc and they came out much better than usual. I always find the colour different in my photos to real life. Still not 100% but better! Any tips or suggestions much appreciated!
Here are a couple of shots of my new cotton yarn.