I don't think ur missing anything, but just make sure the code is valid when your done if you can:
http://validator.w3.org/
http://jigsaw.w3.org/css-validator/
Also make sure you do some SEO stuff like in your header the META tags, such as keywords, site description, page titles, subheadings for content, keywords in the content, favicon for when the site is bookmarked and such could be done.
Some of these things though are prob not in ur original contract, since they fall under search engine optimization, but you should keep them in mind and mention them to him. If it was me I would charge extra for these services.