This is beautiful! You did a great jod for not having a pattern. I think maybe a 2" plain black border and then a 3" border of the black-on-black batik. It would then look like one of those paintings you see in the high end hotels, you have the painting then a black mat and a black frame. They are always very eye catching and very beautiful. But it is your call to make you are the creater of the master piece. Great Job your DD will love it.