1.) I'm a huge fan of all-white kitchens, and have painted two of them.
2.) Its incredibly satisfying to have the insides all white and put down vinyl flooring instead of shelf paper.
3.) I love your kitchen cabinetry, as well as the brick.
4.) I would begin by tidying up the ceiling, as its quite busy. (light fixture as well as the wood structure from where it emanates.)
5.) Hmmm ...maybe even BEFORE that, I would knock out the curved trim above the sink. Takes 2 minutes, and would be a much cleaner look.
Q