The auto slider pics are a good choice...very clean looking site. Under "services" I would suggest more content, around 250-300 words with "key words" that the search engines will search for.
Other then that I cannot speak to any "H" tags or SEO. I know there are a lot of web heads on here that can help you out with that.
But again very clean looking site and it appears that you spent some quality time working on it.