Picture - Graphics, used wisely, make a page. The old saying about a picture being worth a thousand words is true. On the internet it takes up about ten times as much space and time to load. JPGs are best for photo type graphics, and GIFs are best for solid colors. GIFs, only use 256 colors - with some exceptions, while JPGs have 16 million colors.
Most graphics can be either, and browsers can view either.
Patch - Check the links. Those non-local links you once had may have changed. If they have, and are vital to your site, find the new link and patch it. Few things undermine credibility more than a broken link. Purge - Face the fact that some things that seemed a good idea at the time are passe' now.