Thanks so much for the "increasing the picture size" information!Glad that my info was helpful. Another rule of thumb is to check the file size (by right-clicking on the picture and clicking properties), the larger the filesize, the larger you can usually make the picture without too much distortion.
With a little playing around it will be really easy. For instance the picture that Howlin provided in #218 has a much larger file size and could be made even larger without distortion than the one that I played with earlier.