First belly glued up

I have now glued up the two pieces of yellow cedar to make the first belly. I have just been in to the garage to take a photo and it has bowed rather alarmingly. I think that it may be something to do with the leather mat I left it on (the remains of our old leather sofa). Fortunately, the bow is the same way as the wood will be bent to make the belly and the joint is completely sound. The wood 'rings' quite nicely when I knock it. The yellow cedar seems more pliable than the spruce, and I wonder if this contributes to the 'mellow' tone that it is supposed to impart.