I spent a long time working on the background, trying to get the flowers right. I was striving for something graphically elegant and simple like this Polish illustration, but my penchant for realism kept pushing me to add more shading, detail, etc. So, I ended up straying quite a ways from my inspiration.
Below you can see where I've begun working on the background. You can also see my original sketch which I had on a separate layer. As I went along, I decided to make the foreground darker, not only to make it a bit more dramatic, but to add some contrast to the evening sky. After I finished the image, I also decided to crop it into a more vertical format.
Here is the little bunny that we saw in Wisconsin. We had stopped at a scenic overlook for a distant view of the "House on the Rock," and as we walked from the car to the viewpoint, we saw this tiny little guy having his evening meal. He didn't seem at all afraid of us. I was able to get within just a few feet of him for lots of picture-taking.