(4) Headshot Image: An aspect ratio of 2:1 is recommended for better display. Visit Commons: Free media resources/Photography to obtain free images. If using a tablet, you may upload images directly from the camera.
EO is an abbreviation, which stands for Search Engine Optimization. Search engines scan all online resources and index them according to certain rules. Search engine optimization is performed in order to make a website "appealing" to search engines.