Don't lose visitors Keep links to other sites to a minimum. Because attracting visitors to your site is expensive. You do not want them clicking on a link and leaving, having visited only a few pages on your site.
Fast Loading Keep the number of images to a minimum.
Make sure the file size of the images you do use are small. Your home page and indeed every page should contain an e-mail link. Do not use images as e-mail links. Images slow down your page. Plus quite often a visitor does even notice a graphical e-mail link, because they are so used to looking for a text link.