Hi Flavio
Nice sword! Search forum there is much information on bringing out patterns, personally I use different chemical solution based on acids, just lately I found CuSO4 as a very nice way to work with some damascus blades....
To bring out pattern and see nice blade is a matter what you choose, polish it or leave with "patina" I prefer first option and always try to bring old glory of my blades
but some collectors dislike it
Best
Husar