I like the navigation, its really nice!
I would probably change the banner and make it a little more simple. Maybe with just one picture and a really nice font with a stroke and drop shadow.
For your text boxes, they seem to have a base background color, a text color and another background color that is only behind the text. I would simplify it and only use a base background color. Also, try to keep the same font
I don't know what is up with the top part, above the banner, but it has some strange things going on, not sure what it is so I don't really know how to fix it.
For your pictures, I would try to keep the sizes the same.

I am sorry if this sounds a little harsh, I make websites all the time, so I notice really minor things Let me know if you need any help or advice!