To do it right, you need to know how it was originally and follow that pattern !! As well as colors used !! I would agree that your eagle was not well done, but its possible that whoever touched it up was following the lines that were already there !! Check that first, and if not, and you are artist enough to return it to original,, go for it !! I would not try to just strip it,, have it sand blasted !! There are products that can be used that will not do damage to the surface !!