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Here are some commonly made mistakes when finding images for the CoolCalifornia Challenge newsletter:

1. No image source provided. It's extremely important to give the photographer credit for his or her image! Ideally, the author's name should be a hyperlink to his or her photography homepage and the source website (in this case, Flickr) should be a hyperlink to the page where the image is located.

Here at the CoolCalifornia Challenge, our standard newsletter image size is 150 x 150 pixels. But what if you've found an image that is significantly larger than 150 x 150 pixels? You may want to use that image in the future, in a larger size and higher resolution. In Adobe Photoshop CS5, it's possible to crop an image into a square without specifying pixel size or resolution, giving you a high quality image (which can also be scaled down to 150 x 150 pixels for a newsletter).