The first looks a bit flat, but honestly I think you just needed more light and a different angle to pull off that shot is all. The second and third are very nice. You might try the first again with a macro lens, focusing on the center. The blur created by the short DOF (like your second shot) will make the first more interesting.
Not being a flower person (despite my album) I had to look up the term "ranunculus" ... learning all the time!
