It has to do with the size of the picture file - a max of 60 kilobytes is allowed. You can use a photo editor to resize your pictures. I'm not savy with computer lingo, but resizing I know will get you dif. kilobytes. I also think that your photo quality might be too good, perhaps someone else knows how to work on that - e.g. pixels, etc. But get your photo under 60 kilobytes and you're good to go.