There really is nothing wrong with your overview, except the first line. Keep "passion" for other areas of your life. "With over thirteen years in corporate accounting, I have found my passion to be in small business." I suggest something like: "I have over thirteen years in corporate accounting and now specialize in small businesses.
(In your proposals leave out passion - even if the client demands it. Also do not go for bottom-feeder clients just to get your foot in the door.)
If you can show a portfolio so much the better, even if this is simply proof of your certification.
This is only my take on it and I am sure others will give their views too.