Business Card designs

I've been working on putting together some business cards - I am currently thinking of using rendered stills from the koi and the crane as the front. 

Ive also made a sheet of 'back of card' designs, but i've settled for the pink one as below for an example image for now.

 Also am unsure wether to use several designs, or go for 1 single business card design.. Below are the designs so far

business card 1

business card 2

business card 3

business card 4