Just some quick impressions - nothing more detailed than that, and I far from being any sort of expert.
1. You may need some sort of power capacitor - a large electrolytic, typically about 1000uf or higher to stabilize the power connection through USB. It's one of the issues with the ODAC, IMHO, in that it has no power cap anywhere on the PCB. If USB power is a little "iffy" or unstable, chances are that it gets knocked offline more often than not. A power cap is insurance.
2. I think you need some more ferrites in there - perhaps one after the main USB 5V buss, and at least another ahead of the input to the regulator. You have one ahead of the DAC supply voltage, but there may be another place or two where they might be useful. USB power is dirty. Ferrites at strategic places insure that high-frequency trash (above audio) doesn't screw up the digital/analog processing.
3. Many people are going straight to a clock oscillator chip these days. The crystal is fully functional as you have it, but you may get better performance with fewer parts and less cost with a clock oscillator, instead.
4. As I say, I haven't studied it thoroughly, but you may want a separate, dedicated regulator for the DAC chip in addition to the USB chip. Sharing the supply and current between both of them may not result in the best performance. However, you need to temper this with your goals to keep it simple. If simplicity is your goal, then maybe it will work fine the way you have it shown.