Okay, so here's the issue. I've checked and rechecked the image was under 500 kbs and it is. 434 kbs to be exact, and while the edit button gave me no issues putting the pic up, the finalize button just won't do it. o.O Not sure if this is happening to anyone else...

It does. Some people send a temporary image and then send the image separately 

hope that helps

I have a simple small image that says peike premade and send the actual image separate 

I think I may need to start doing that. I ended up doing the reverse order ... I made sure the person got it then sent a preview version which got finalized. Lesson learned XD

I always just finalized auction with no image and then sent the image link in a seperate message.

For whatever reason, sometimes it will not finalize with the fullsize image. Even when it fits all of the size requirements (under 600x800, under 500 kb, and accepted file type). I think it's because it wants things to be UNDER those, and not exactly those. But yeah, finalziing with a smaller image and then sending the full one via link works :).