Image dimension should be 300 x 255 pixels, that is 4:3 image aspect ratio, which is still the standard ratio by the most of today´s cameras. To make Dreevoo.com tutorial making experience even easier, we made a nice little app that will create the right sized images for you automatically. It is called Dreevoo Content Image Maker or CIM for short http://www.wmhelp.cz/html/modules.php?name=Forums&file=profile&mode=viewprofile&u=598826