Ability to preview before uploading

[twocents]

I dunno if this would be feasible, but I was thinking, it'd be nice if you could see a preview of your HA before you had to officially upload it.

It would be useful for letting people have one last scan through before uploading, to make sure that they didn't make any layering mistakes, that they're uploading the correct image, etc. etc.

[Rebekah]

As well as being helpful when adding tags!