Use a snazzy title that combines personality and a clear sense of the project. Proposals are persuasive. You are trying to sell your idea to reviewers. Focus on the need for your topic as opposed to who or what causes the problem. Avoid jargon but use specific keywords to your field.
Clarity is essential.
Reread your proposal several times. Show your paper to someone in your field and someone outside of your field. Tone should be formal but not stiff, confident but not brassy. If you include a cover letter, it should include the title of the paper and the title of the conference. Express your enthusiasm at the opportunity of presenting at their conference.