don't think so. you should have saved the picture to your desktop, used it in windows gallery and rotate and save it there. then load it on gravatar. that's how i'd do it anyway x
it's easy. right click on the picture and select save as...; and select desktop for the file location and leave the title(but make a note of what it is e.g. picture 06745 or something). then, go back to your desktop and left double click twice. find picture, rotate when required and the image should auto save and remain on the desktop (it's easy to find on there). then...do gravatar stuff with it! x