He wrote about the following: good speaking voice polite style need to make my visual I used for class clearer (in terms of being able to see it)
Sounds like he was complimentary of your style. Now work on your focus charts...here's a site that might be handy... http://chartchums.wordpress.com/
I would take it as good overall. Not only did he point out what you're doing well, but he took the time to point out something specific you can work on. After tons of middle of the road, comment free evaluations last year, I found myself eager for the APs who took the time to really comment on specifics. so be grateful you have a principal who cares enough to do so.