I'll make this as simple and painless for you as I can:
1. Over 90% in all language tests on Freelancer.
2. A few short stories and one full novel, all available on Smashwords and Amazon (Google me). My novel is free on Smashwords so you can sample my writing there.
3. A job at an ad agency, where I do copy-writing.
3. I can adapt my writing and change styles. If you sample each of my stories, you'll notice a subtle disparity in how I wrote each one. At the same, I was still trying to find my own writing 'voice', and so I experimented with different styles and genres.
Pick me. I'm the man for the job. Simple.