This is a nice composition here. Clipping off parts by letting them run off the edges makes a good use of the picture plane and gives a sense that there's more there we're not seeing. Try to play with the hand a little, maybe by using your own hand and a mirror to get a more natural pose.

if you were banned it would show in your user details, so you probably aren't. If you aren't able to access the picture at all to revise it then it might be that someone was working on it, didn't finish/submit their changes, and didn't click the "unlock" option. Whenever someone is working on a collab the picture will be locked so that no one else can work on it at the exact same time. If they don't submit their changes and forget to unlock the image before closing the window then no one will be able to access it until the original poster clicks the unlock option near the edit/revise options.

If you actually were drawing and had access to it but couldn't click submit, then I don't know why. I think someone else had that issue recently.