For the gradient I used Fashion Wedges, I bought them from Dollarama (they can be found in the cosmetic section)
here if you want to see the listing; if you cannot open the link you can visit there store :jetwinson (or you can search '3X LARGE SHEET 220 NAIL IMAGES IN 1 NAIL ART TATTOOS' and go though the items listed).
I applied 2 decals on most of my nails for this manicure. Also before applying a top coat make sure your nails are dry. How the manicure looked once I was done: