If you have a site on the German Shepherd dog, I want to see, read and explore the world of the German Shepherd dog. Consistency in Design - Design is the theme layout of your site. If you have created a very conservative type business site then please keep it in that theme throughout the site. It is important that a visitor knows they are still at the same site. Always have a link on every page that will take a visitor back to your main page and if you have multiple links on different pages, it is always best to direct your visitor back to that referring page.
Good navigation is the sign of a good web designer.
How and where they are placed. Placement of graphics is important and it will show. Stuffing too many graphics together will look too cluttered and will overwhelm your visitors. Spread out too far and your page will look too desolate and cause too much scrolling. If you have a heavily loaded graphic site, like mine, indicate that on your main page and then do everything possible to reduce their download time.