@deborah-Haagenson so sorry for the confusion, I'm going to try to explain why I was asking about image size.
By image size I meant the size of the image as it appears on a laptop or tablet screen, which is totally variable depending on how the image is saved and uploaded for web viewing. The specs that we were given (5.4" x 8" with .25" bleed) are for print - meaning, if you're working digitally, your document or image size would be 300dpi and 5.4" x 8" plus a .25" bleed. If you're working traditionally, you are creating a drawing/painting/whatever that is 5.4" x 8" with at least 1/4" additional border art on each edge that would cover the bleed and then scanning the artwork at 300dpi. (Of course either way you could work larger than 5.4" x 8", but your work would have to be scalable - proportionally larger, so that when the art was reduced for print, it would meet the specs.) Anyway, I was just hoping that we could see the cover submissions at a uniform size - the ones that have been uploaded so far are many different sizes.