I was right about: Adding silver details to the existing mural would be the easiest part. It took me approximately 1.5 hours only:
Please excuse my poor photography skills!
I know it isn’t a major change, but it looks much better nonetheless!
All you need is silver acrylic paint and a paintbrush. I used up less than 1/3 of this tube. I already had these among my paint supplies, and the price tag was no longer on the tube, but if I remember correctly, it cost around ₱ 100.00 ($ 2.50)—and this is already of quality! And you can get a paintbrush for only ₱ 20.00 (50 ₡).
Total Cost: ~ ₱ 120.00 / $ 3.00