I have done black with custom similair to yours and wasnt happy..the nail flows much better with a more transparent powder (any of the perfect colour range..even clear) IMO.
For the lunula a silver glitter (think millenium nail graphix or CND twighlight even) would have given a pretty bling without having to add rhinestones at all.
I think keeping it simple and consistent always looks best..especially in photography.
For a custom blend you really do need a reverse french to keep it crisp (when it comes to black)..if you want to go that way.
Enter your email address to join: