Update before this:

I posted my latest update and then the one before that so you could see the difference. I have done a lot of work on this even though at first glance it may not look like it. The biggest thing was adding some warmth to the shadows. I also added another layer to the background, and many layers of yellow to the petals some warm some cool. As I build up the shadows you can begin to see the depth that it creates. A couple little tweaks and the left hand sunflowers will be done. Then I will concentrate on the main one. You can see the process how my centers start out with blue (my husband says you are not leaving it blue are you lol) and then I will glaze over top until I get the desired value and color.