Board Member Photo – 400x400px * as long as the person's face is in the center of the image and is larger than 350px, that is really all that matters. If the images can be cropped to the same size/dimensions, that is even better, but not required.
Directory/Partner Favicon – 108x108px * image should just be in a square format and larger than 100px so it can fit nicely inside a circle on the front end of the site
Directory/Partner Logo – 512x512px * this image just needs to be at least 500px wide and can be horizontal or vertical in orientation. The height is not as important as the width
NOTE – When adding images, ideally a .png is the preferred format, but jpg is also acceptable. Avoid uploading very large or high-resolution images to avoid creating speed issues on your website.