Providing a well written business plan and a nice presentation may not enough to be approved with the loan. Banks are always looking for something beyond business plan, complete documentation and nice presentation. They cannot be deceived by sweet talks and "to-good-to-be-true" promise. They feel confident lending their money for a business an entrepreneur can afford to invest. The bank will also look at your capability of paying back the loan regardless of whether your business will be successful or not.
Provide all the necessary information to make your business look professional and credible. Write a well thought business plan, show that you understand your market, and show your income and expense projections.