Playing around in Photoshop again, this time with Hue and Saturation, but I still can't get close to the sparkliness of the original.

I've added in some small touches Schminke Gold Perl, which is a shade lighter than the Art Spectrum D'Or on the various leaves and flowers to add extra highlighting. It can be seen in the blown up version of the N.

Just the right bottom corner, (already taken back) and then I can paint the N.