If you want to you can go into your ZeroNet data folder, find that image, copy its name, delete that image, put the gif there, rename the gif to what you copied earlier and then resign your account(by for example making a post, following someone, liking a post). This will make your post a gif, but yeah, no support on ZeroMe for gifs(for now).
@Whitehat13: it supposed to be gif. Not supported here, it seems.
hehe cool photo