Hello...Caina? Well this is an interesting name, but I certainly like it. Hi Caina! :D
Yes, mods can. They can do that by uploading an image into their albums. They must, when creating the album, mark it off as a "profile" album to represent it holding images used for profile decoration. Then they can upload images there, go to the User CP and customize their profile in the fields that allow them to search for album images.
You can try signing your name on it, or you can watermark it...which is essentially just putting your own signature somewhere on your work and lowering the opacity to a certain degree, so if it ever gets stolen there is proof that it does belong to you.
Anyway Krad, when you post your work up to show to other people it's a risk you would have to take, I do it anyway despite the risk of having my work stolen, which is why I either watermark my work or stick my name on there as a signature. :o
Apparently it is apparent that the apparent age I apparently would apparently want to apparently be is an apparently childish age that is apparently contrasting towards the apparent adult stage I've apparently reached. Apparently it is inevitable that I apparently can apparently be an apparent young age again, however, I apparently would apparently like to apparently state that I apparently would like to be apparently 5 years old