Check out this short list of important tasks to do in the wiki!
Per our art policy, any non-official or non-Sonic images must be accompanied by permission from the original artist before being uploaded, else they may be deleted. If you are the artist yourself, you must state this clearly on the image page.
Please make sure you do not post fan fiction in our mainspace articles. For more info, go here.
Seeing that you seem so good at this, I have a tip for you to follow: when making ogg files of the soundtracks, it is preferable that their length matches that of the original soundtracks. If you have any questions about how long these official soundtracks are supposed to be, you always look up the albums here or on Sonic Retro.