The img elements for the thumbnails in the code that follows are coded within the elements Image Swap Click on an image to enlarge. Animals a. so the user can swap the main image by pressing Enter when a thumbnail has the focus b. so the user can access the thumbnail links by pressing the Tab key c. so the application is easy to use by the motor-impaired d. all of the above

For question 1, i'm a bit stuck between serif fonts or large enough type to read. serif fonts are good fonts to use because their easy to read. but you also need your type be large enough to read. if i had to say what you need to consider most important, i would say d is the answer.  for question 3, i believe the answer is d. it seems most appropriate to do that. on every page or every other page would be too much, and only on the contact page just seems inappropriate.  for question 4, it's probably a. by "color scheme" it doesn't mean just one color, but a set of colors. colors that are complimentary to each other. having too many is too distracting so it's best to limit it as much as possible, but not to the point where your website looks dull.hope this !