(Hope I'm posting on the right board)
Here's a few thing you need to know when uploading media online(I was also bored):
-If you're uploading your own work make sure it's a png or jpg. If you upload anything like a psd file, anyone can download it and make it their own.
-Don't include anything copyrighted. If, for example, you have the Warner Bros logo in your image you'll likely get busted for copyright infringement.
-If you're using someone else's work make sure you have permission and credit them.
-Having a watermark is very useful. People can't claim it as their own if it's got your name on it.
-Don't upload a file too large. You'll get lag.
Some of these are pretty obvious. If anyone has questions go ahead and ask.