Do you still have your original "sketch" as a separate image? If so, I would HIGHLY suggest starting over with that and then build everything in layers. When you want to use the magic want tool, I typically have to hide (click the eyeball) most other layers so it does not get greedy with the selection. Not doing this is part of the reason you are having the magic wand tool get all sorts of other stuff since you also had some parchment texture and it was trying to be magical......