"I am the best","I will do i 3/4th of the cost","I am experienced","I am speed",.
No, I dont write all of this. Coz everyone writes the same thing again and again and again. And clients are completely bored of this. I remember last month of their was an after effect project i played on. And in description i wrote.
"This is my bid, know what I do I ain't a kid. I like the offer so dont refuse, i am the guy whom you will again use. Price is good to me,days will go with me."
And i won that bid. Not because i rhymed there, but because i was being myself. Client always looks who is the one out of the way.
Hope it helps.