Provide a clear example of a similar job you have done in the past.
I work in television, motion graphics. Please refer to the "Top 30 Countdown" intro for an example of what to expect. That particular piece's aesthetic is not what I would create for you, just a general picture of what can be achieved..
Proposal:
Hi! Am Steve, a seasoned Cinema 4D/After Effects motion designer with strong animation and photo-realistic render skills and I would love to create your YouTube intro animation that enhances your brand. Please refer to my portfolio on this site for samples of work. In combination with post production in After Effects, I will deliver a finished product that is above the cut. When you hire me for this job, I will devote all my time to completing your project on time and with excellent results. I value client feedback and have no problem making changes where you need them. I guarantee world-class results without the drawbacks usually associated with hiring a freelancer, and all this comes at a really great price! Am ready to get started soon as you green-light this project. If you do have any questions for me please send me a message, I usually answer in under 10 minutes.