The painting below is one I just did, but from a photo I took last year or the year before. The photo is below it. This year, as I mentioned, the leaves were much more yellow on many of the same trees than they were in the previous year. I don't know what changes the colors, but it's interesting. Both photo's were taken on a semi-dreary day, so it's not the sunlight of the day that changed anything. Both were also taken in the same time period, as the same trees are still green behind the main tree.