I think that it would look good at the top of your back in the middle of your shoulder blades.
I wouldnt get it in white, it would be pointless really.
I think that black will look best. You would be pushed to get black and grey shading in there.

post some pics when it is done 🙂

I personally have never used numbing creams.
I have a tattoo in a similar position to yours.
To be honest I think the pain is down to the individual as mine didnt hurt that much. The only place that it hurt was around the waist area.

It is probably worth giving the numbing cream a shot.

And remember – mind over matter!

I have koi carp on my forearm.
I am getting them shaded black and grey next friday so will post photos then (dont like too before they are finished)