Tony, the cutting is amazing, I don't like that I can see the heads of the nails you used. On something like this piece, if I need to use nails to hold things together. I usually find an inconspicuous place to place them, if I can't find one I place them to compliment the cutting. Try to find a place to place them that evens them out, like one in each corner or halfway between the top and bottom of the cutting. They have to be placed in a way that doesn't look as if they were just used to hold things together. This is just my opinion and the way I do things, you're no obligated to do as I suggest.
Len