Form and Emptiness

I have two versions of this. There's only one slight difference, the other one is without scales.... but I can't choose which one I like best so tell me what you think.

This is my tattoo design for when I turn 18
(my sister also wants a matching tattoo)
I originally just wanted a yin yan but christina came up with this more creative idea with the koi fish. I like it

I drew several versions, some more elaborate, some more simple... in the end I chose this.

the writing are the chinese characters for Form and Emptiness, this was taken from the buddhist text The Heart Surtra.