Originally Posted by Candace
I would have it framed professionally using the proper techniques for fabric and perhaps have it put under UV light resistant glass if it's a valuable piece. I don't think sewing it would add anything to the piece and may decrease its inherent value.
I agree with Candace. Anything beyond this will decrease the value. I think you should explain this to the owner as well. If they opt for any of your other options then that is up to them. But if it was me, I would not touch it.
I must say this is a magnificant piece of work!