To find the perfect image you are looking for using Google Image Search, click on the Search Tools button at the top of the search results page. The Search Tools will guide you to find an exact size image, color or type of photo or drawing. Filter your image search to include only photos with faces, clip art, high-resolution images etc. Click on the drop down menus to select the filtering options: All Results or By Subject, Any size, Any color, Any type. For example, when you search for the Statue of Liberty you can look at the images sorted by subject, your search will be sorted by the Statue of Liberty's face, head, close up, black and white, and so on. Click on the image to explore.
Sharpen your search skills and learn more here: Google's Power Searching Quick Reference guide.